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12 Volt 125Ah Lithium Deep Cycle Battery

(36 customer reviews)
  • Ships internationally to most countries
  • Free shipping in the U.S.
  • 11-year warranty

$1,079.00

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Warranty: 11 Years

  • Comparable to 900 cranking amps
  • This battery can be used as a starter battery for 250 hp Yamaha or Mercury motors
  • Battery Management Systems (BMS) with power terminal cut-off and recovery
  • Ionic batteries have proprietary software embedded in the BMS to make our batteries 100% compatible with Yamaha or Mercury motors
  • 70% lighter than lead acid batteries
  • Two to four times the service life (3000-5000 cycles)
  • Great for marine, RV, floor sweepers, lift gates, UPS systems, solar energy storage
  • Cell balancing and low voltage/over voltage protection, short-circuit protection
  • Bluetooth technology to monitor battery status
  • Maximize your energy potential with 99% Depth of Discharge (DOD)
  • Drop in replacements (plug and play)
  • Run as many needed in parallel
  • Can go up to 4 in series with this battery
  • Comes with an 11 Year Battery Warranty to give you peace of mind with your purchase.

Magnuson-Moss Warranty Act: A vehicle manufacturer cannot legally void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)). Ionic Batteries have proprietary software embedded in the Battery Management Systems that make them 100% compatible with Yamaha or Mercury 250 hp motors. Learn More

Product Description

Ionic Lithium Deep Cycle 12 Volt 125Ah Battery

World Class Safety Features

Ionic Deep Cycle Lithium Battery 12V125-EP has 12 volts and a 125Ah capacity and is perfect for powering your deep cycle systems. Can be used as a starting – dual Lithium battery comparable to 900A cranking amps for 250hp engines. Ionic Deep Cycle has an internal microprocessor controlled battery management system (BMS) that monitors the key operational parameters during charging and discharging, such as voltages, currents and internal temperatures.

Ionic 12V 125Ah batteries used as starters batteries have been engineered to work with overcharging issues that different outboard marine motors have.”  “Ionic 12V 125Ah batteries used as starters batteries will work with outboard motors including Mercury and Yamaha.”

Built for Long Lasting Reliable Power

The Ionic Deep Cycle Battery has a cycle life of 3,000 cycles or about 10 calendar years. Our lithium-ion batteries have a usable capacity of 99% compared to 50-60% for traditional lead-acid batteries]. LithiumHub Deep Cycle batteries function in the widest range of temperatures with a discharge temperature range (Functional) of –20°C to 60°C (–4°F to 140°F) and a charge temperature range of 0°C to 45°C (32°F to 113°F). Automatically detects if batteries are too cold to take a charge.

The Ionic Lithium Deep Cycle line has the best weight to power ratio on the market

At 12.55” (L) x 6.5″ (W) x 9.22″ (H) and weighing only 34.2 lbs., the Ionic Lithium Deep Cycle 12V125-EP has the best size to power ratio of any deep cycle battery on the market. Connectors: 3/8 UNC Threads allow the battery to be installed in any direction unlike lead-acid batteries which are fixed. Ionic Lithium Deep Cycle Batteries self-discharge rate per month is between 1-3% compared to lead-acid batteries which are about 30%. Max charge voltage is 14.6V and the discharge cut-off voltage is 10.5V. Max charge current is 80A and max discharge current is 100A / 350A(3s). Can be charged with solar chargers. Can be charged with most traditional lead-acid chargers that do not have “Desulfate” mode, provided the current levels do not exceed lithium battery charge specification. Using a traditional lead-acid charger that reaches 14.4-14.6 volts will allow the battery to be fully charged. Chargers that do not exceed 13.6 volts will only charge the battery to 50% capacity or less.

Product Dimensions

Group 31 measurements

Widest spots. The battery does taper on the very base bottom.
Length : 12.52 in. => 12 1/2 in. => 318mm
Width: 6.496 in. => 6 1/2 in. => 165mm
Height (studs base): 8.465 in. => 8 15/32 in. => 215mm
Height (studs top): 9.2 in. => 9 13/64 in. => 233mm

Fits Group 31 and Group 27 battery trays

Has Bluetooth connection

Has Bluetooth connection
Can be charged in series

Can be charged in series
Can be charged in parallel

Can be charged in parallel
Free Shipping

Free Shipping
Lithiumhub 30 Day Return Policy

30 Day Return Policy
11 Year Battery Warranty

11 Year Battery Warranty
Model IC-12V125-EP4S
Voltage 12V
Capacity 125Ah, 1600Wh
Chemistry LiFePo
Weight 34.2 lbs (15.5 kg)
Dimensions 12.55″ (L) x 6.5″ (W) x 9.2″ (H)
319x165x234mm
Life Cycles 3,000 @ 80% DOD
BMS Yes (Internal)
Max Charge Voltage 14.6±0.1V
Discharge Cut-Off Voltage ~8.0V
Max Charge Current 50A
Max Discharge Current 100A
Crank Amps 900A
Pulse Discharge Current 500A (5S)
Operating Temperature -20~60℃
-4℉~140℉
BCI Group Size 31
Terminal 3/8-16 UNC Thread

Please read our frequently asked questions page for answers commons questions regarding lithium ion batteries.

Ionic Deep Cycle Manual

Spec Sheet

Bluetooth Guide

Safety Data Sheet

Share your thoughts!

5 out of 5 stars

36 reviews

Let us know what you think...

What others are saying

  1. One person found this helpful

    Question

    jmedlock (verified owner)

    Will my Mercury Alternator Charge my 125AH IONIC?

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    • One person found this helpful

      MK (verified owner)

      Yes it will with no issues.

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  2. Mark B (verified owner)

    Ran two helix 12’s and a helix 9 along with my aerators all day long plus starting my engine and the battery was flawless not to mention a much clearer picture in my units based on a more secure and stronger power source. Customer service was excellent and I received my package in 3 days!

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  3. Dana S Andrews (verified owner)

    Ordered 125 ah and Love it so far. Jeff was a huge help.aldo!! Be purchasing 2 100ah for trolling motor soon.

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  4. Question

    Ron Moore

    I have heard of issues causing potential damage to the outboard alternator and/or regulator when the lithium battery is fully charged. I am very interested in eliminating my wet cell battery but am reluctant to move to Lithium without worry that I may damage my Mercury Optimax outboards charging system components. Can you offer any data or reassurance that this isn’t an risk?

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    • MK (verified owner)

      The issues are the power spikes from the alternator over 15.2 volts that’s will shut down the battery. That issue will not happen whit our batteries.

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  5. Ronald Kelley (verified owner)

    Purchased Bass boat bundle with 125ah cranking battery and 3 each 50ah and charger. Plus a double battery tray and a single battery tray for 50ah batteries. Install was easy with new trays. Had to modify mounting bracket for charger to replace 3 bank dual pro. Replaced 4 group 29 Interstate deep cycle and old charger which removed 178 pounds from back of 2001 Ranger R83 with Yamaha HPDI 150. 125 cranks engine great and powers all onboard electronics. Two 50ah for trolling motor are great. Third 50ah running 126sv Garmin with Livescope at bow and 10” Lowrance HDS at console. If batteries last advertised life cycles this should be my last batteries since I’m 72 years old. Would recommend to anyone who is getting ready to replace old lead acid anchors. Service at Lithium Hub with Jeff is outstanding.

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  6. JASON NAPOLSKI

    Awesome batteries and the app is fantastic to monitor usage, fantasic upgrad to my Bass Boat

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  7. Jeffrey Mooter (verified owner)

    So far love it

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  8. Nick (verified owner)

    Works as expected

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  9. Randy Krempp (verified owner)

    These batteries and charger are unbelievable, you can fish for three days straight and not recharge them till you get home. I really appreciate the app for the batteries, you can check state of charge at any time.

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    • MK (verified owner)

      We are glad you like them. Thanks

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  10. Rodney Lowery (verified owner)

    I am pleased with the battery I believe it’s going to provide plenty of power for my electronics

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    • MK (verified owner)

      Thank you

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  11. DoubleB (verified owner)

    Truely an awesome battery, fished 2 8 hr tournament’s and have 97% still on my starting battery.
    Thx lithium hub…!!

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  12. Steve Bealmear (verified owner)

    Excellent product performed just like they advertised

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  13. Dimitrios Georges (verified owner)

    This product performs exactly as advertised by IONIC.

    I use the 125 AMP in my boat (cabin cruiser) as both a house battery and a starter battery for my 2020 Yamaha 115 HP Outboard. I enjoy days of “boatercamping” with little worries about power for camping and/or starting the motor. I have two downriggers, two sonar units, and numerous other electronics hooked up to this powerhouse with no problems. The bluetooth feature gives me great piece of mind, and I can keep up on the status of my 125. After a couple of great days out on the water, I go back to the boat ramp parking lot and bring my generator down to the dock. I charge the 125 up in a couple of hours (3000 W generator), and I’m ready to go back out for a couple more days. BRAVO IONIC for another great product.

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  14. Bruce Tivao (verified owner)

    Fantastic lithium marine battery 125Ah- works very well with my Ranger/225 H.O Evinrude, and all new upgraded Hummingbird electronics. Now getting ready to upgrade batteries for the Minn Kota 360…So far, highly recommend Ionic Lithium batteries!

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  15. Dave (verified owner)

    The 125 ah powers my boat -2 graphs occasionally the live well and starts either the 150 or 9.9 with no problems whatsoever and no dropping offline or Mercury charging system issues, the BMS is magic. The battery is so good, I’m going to upgrade the onboard charging system to allow distribution of power to the trolling motor batteries from it. Should have done this upgrade earlier.

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  16. Scott Webb (verified owner)

    The battery is amazing. I use it for my house battery to run everything in the boat. I ran it 8 hours with 2 12″ displays going all day. When I got back to the ramp the batter was at 98% (The motor charged the battery from spot to spot). Truly a game changer and the app is wonderful.

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  17. Gary Belknap (verified owner)

    Very happy with the start battery and the 3 – 50 amp trolling motor batteries. Ran 4 12 inch graphs live wells mega 360 hydro wave power poles for 9 hours and still had 66 percent battery left. Boat never hesitated once to start. After standing on 36 volt Ultrex all day still had 83 percent battery left over. Took 145 lbs. out of the back of the boat by removing 4 agm batteries. Boat jumps up on plane faster now and picked up 2 mph. No downside that I can see by switching to Ionic Lithium. 4 bank charger is very nice also and the Bluetooth Ionic app is way cool.

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  18. Andy Sanazaro (verified owner)

    Only used it a few times so far but I am amazed at the all day power and really like the Bluetooth app for monitoring battery!
    I went from 11.7 volts after 6 hours on a big lead cell to 13 plus all day long on a ionic lithium. I will be replacing all of my batteries with these as they fail in the future.
    Guys at the shop are great at answering any questions!

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  19. Question

    Steve Laehn

    Can these be used in conventional power centers / battery boxes?

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    • MK (verified owner)

      Yes they can.

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  20. Eddie D Farmer (verified owner)

    Ran all electronics one bait well one live well over 4 hrs still had 93% left awesome battery.

    (0) (0)

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  21. Doug (verified owner)

    starts my 250hp Yamaha and runs my 2 Solixs all day long!

    (0) (0)

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  22. Dave Fellrath (verified owner)

    Great ran boat all day and all the batteries were still over 65%. Love the app.

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  23. Robert Wright

    Lithium Hub batteries and customer service are second to none. Their products continue to deliver everyday. I spend 9 hours 3 days a week on the water and my batteries have never gone below 50 percent. It is amazing. I have used interstate, optima and north state batteries and never had this kind of performance.

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  24. Question

    Mike Casper

    I have a 21 foot Allison XB21 2×2. The trolling motor is a Motorguide tour pro. I only fish 8 hour club tournaments now. Will 2 12 volt 50 Amp batteries hand the 80 lb thrust ( I do fish tidal rivers) or would I need 2 100 Amp batteries. Thanks in advance Mike

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    • MK (verified owner)

      No sir, you need two 100Ah batteries.

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  25. Rd

    Use a couple of these at our off grid cabin for solar storage. Very handy to have the Bluetooth monitoring .

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  26. John Moore (verified owner)

    I get days on the water before I have to recharge my batteries I got three 125 ah batteries and they are great also got the 4 bank ionic charger Five ***** .

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  27. Robert Willis (verified owner)

    I bought 3 of these 125AH Ionic batteries with 2 for my 24v trolling motor and one for my cranking and electronics. After 3 seven hour tournaments they are about 62% & 75% full still! That’s with two 9 inch fish finders, Panoptics, livewell, and lights running all night! Best battery and support out there! And the phone app is great for seeing what’s going on with the batteries!

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  28. Question

    James Geirman

    Can you mount in any position? Having some space issues at the moment…

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    • MK (verified owner)

      yes you can mount any way.

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  29. Paul (verified owner)

    Using for a house battery for RV and it has worked perfectly!

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  30. Brandon (verified owner)

    I purchased two of the Ionic 125AH blue tooth Li-ion battery’s a little under a year ago . I purchased them to create a large power station in my 86 VW Vanagon to power a mocha machine , pellet smokers, LED lighting for the purest of glamping comforts my mind can think of. Now I’m ordering two more 125AH batteries to create the same setup in my WW2 1946 Karr trailer . Setting up a system like this is very complex which is why the customer service and engineers helped me figure out the best solution for my application/power needs. The blue tooth app. Is very useful and easy to use as well. Thank you Jeff In customer service for helping me with all my questions and guiding me in the SAFE/right direction .

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  31. Rick Plummer (verified owner)

    I bought three of the Ionic 125 ah batteries for my bass boat, three battery trays and the 4-bank charger. I’ve got to say I’m very impressed from the quick shipping, expert packaging, and all around support for the products. The blue tooth app is a great tool for keeping track of your batteries. The weight I saved in my boat is just plain crazy. Haven’t got a single negative thing to say about Ionic products. Can’t recommend them strongly enough.

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  32. Jerry

    Starting a new year with my IONIC 125AMP cranking battery. It has been bullet proof, never letting me down. I run 2 Lowrance Live 12s, livewell full power all day and have never even had a glimpse of a problem. Just the best to be had. Cranking a Yamaha 250 HP SHO 4 stroke. Plus my IONIC trolling batteries are the absolute best.

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  33. Bon Gotuaco (verified owner)

    Love this Battery! I run an HDS16 , 12 Live and a Garmin with Livescope. No voltage issues whatsoever. Would recommend this battery to anyone. Also love the 3 50ah TM batteries. Can easily run all day with all of them and fires up my Verado without any concerns.

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  34. Question

    Bullet Bob

    Can you use a regular 12 volt battery charger to charge the lithium?

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    • MK

      Yes, most regular lead acid charges will charge our ionic lithium batteries if the charger is under 15V.

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  35. Rickey Umberger (verified owner)

    Love this battery it’s lighter than most . Bluetooth is awesome on it

    (0) (0)

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  36. Question

    John Maio

    Looking for a dual purpose cranking and deep cycle marine battery for my bass boat. I saw you 100ah HP. but it doesn’t have cold cranking amps listed and I can’t find any information about warranty

    Any help would be appreciated

    (0) (0)

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    • MK

      Both the 12V 100Ah and 125Ah batteries work as dual batteries. The 12V125Ah is recommended to run graphs and start engines up to 250hp. The CCA rating is 900A. All of our batteries have a 5 year warranty with them.

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  37. Don Laturell

    This is the second 12V125EP purchased for my RV. While going down the road I charge the batteries from Victron Energy Orion-Tr 12 I 12-9 isolated DC/DC converter. I have both batteries wired in parallel. Before I connected both batteries, I partially discharged one of the 12V125-EP batteries to see how well the two batteries would balance. For the first few minutes, the fully charged 12V125-EP discharged at a rate of 25 Amps into the partially discharged battery. After about 5 minutes both batteries were balanced. Then I fully charged both batteries using a Progressive Dynamics 9245C charger / converter with a PD92201 remote charge pendant. The remote charge pendant manually controls the boost mode placing the charger at 14.6V, ideal for fully charging the 12V125-EP batteries while connected to power at a camp ground. The blue tooth app is used to monitor state of charge. Once the batteries are fully charged, my RV has a switch to disconnect the batteries from the charger / converter. These lithium batteries, unlike lead acid, have a very low self discharge rate. I have done a short term test not charging the two batteries for 2 weeks. This is to test how well balanced both are. After 2 weeks, both batteries are at 99% charge.
    Amazing!

    With 80% DOD, this is like having 400 AH house batteries compared to the old lead acid.

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  38. RV House Battery

    Don Laturell

    State for charge after 2 weeks (2 batteries in parallel)

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  39. Tim Gamble (verified owner)

    Very pleased. Quick delivery as well

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  40. William Glawson (verified owner)

    Awesome batteries and I always know how much power I have left with the App.

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  41. Rocco Altobello (verified owner)

    I am impressed by the fast charging of the battery and the weight. Purchased two 50 ah batteries for my trolling motor and one 30ah battery for my sonars great batteries would recommend them to who ever owns a boat. Batteries of the future.

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  42. James Pilarski (verified owner)

    Cranking battery is excellent, I’m running dual power poles, Helix 12 & 10 plus all other accessories. Engine cranks over quickly

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  43. Danny Clark

    Awesome product light weight and plenty of power. I also like being able to check the condition of the batteries on my phone

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  44. Question

    Dave

    What battery will start Yamaha F300

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    • MK (verified owner)

      The 125Ah starts my 300 Yamaha

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  45. Question

    Ryan

    What type of charger do you use for these. I need one 125AH cranking battery at transom. Then I need two trolling motor batteries at bow for 24v ghost trolling motor.

    I want to put a 3 bank on board charger on the boat to plug in and charge.

    Your 4 bank only has 5’ whips could I extend that wire back to transom starting battery and only connect three banks?

    Please advise

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    • MK (verified owner)

      You can use the 4 bank charger and we have some kits to make cables longer. the 4 bank you can double up on the starter battery.

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  46. corey_bradley (verified owner)

    What can I say – I can say a lot. The first time out I fished a 9 hour tournament. We caught a keeper within the first 5 min and ran both livewell pumps all day long. On my boat I also run 3 units, 360 Mega and a radio have to have some music. After putting the boat on the trailer I checked the Ionic 125ah cracking battery and it was sitting at 58% enough to fish another full day tournament. At the ramp a few people were checking out the new boat and was really impressed with the live of all 4 Ionic batteries.
    Thank You
    Corey Bradley

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  47. Question

    Dan (verified owner)

    Do you have a lithium battery that can start a Mercury Verado 350. I have three of the ionic 125AH for my trolling motor and love them. I also have two lead acid batteries that run my graphs and are my starting batteries want to get everything onto lithium batteries

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    • MK (verified owner)

      Two of the 125Ah batteries in parallel start your engine and run all your graphs.

      (0) (0)

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  48. Question

    MARK D. JACKSON

    Can this battery be used as a 2nd battery (a “house” battery) in a van and charged from the regular engine alternator?

    (0) (0)

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    • MK (verified owner)

      Yes with no issues

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  49. Question

    Donnis

    Do you have a lithium cranking battery

    (0) (0)

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    • MK

      The 12V125Ah can be used as a dual battery for starting as well. The 12V125Ah is popular to start 250Hp outboard engines.

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  50. Question

    Tanner Byers

    Will my minn kota 3 bank charger, charge this battery? An or the 12v 50 amp batterys for trolling motor?

    (0) (0)

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    • MK (verified owner)

      If it has a AGM setting it will work.

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  51. Robert Dickens (verified owner)

    I purchased the 125ah battery and a 10ah charger. I’m totally satisfied with my purchase. Love the battery and the app.

    (0) (0)

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  52. Question

    Mike perry

    What kind of charging system works best on them I have duel pro chargers on my boat will they charge them thanks Mike

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  53. Charles Watts (verified owner)

    Replaced a group 31 AGM (80lbs)
    New 125ah w/ cranking amps
    Starting a Merc 250 effortless.
    Running four HDS 9’s, lights, livewells. 1/2 day fishing, 89% capacity left.
    Improved holeshot.
    Need to get you some of these!
    Compatible with my existing charger(s).

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experience the advantage of ionic brand lithium batteries

3 blue LithiumHub Ionic batteries.

11 year
warranty

Buy with confidence with our competitive no-nonsense 11 year warranty.

grade a
cells only

Ionic uses the best cells so your battery lasts longer and performs better.

bluetooth
monitoring

Monitor your charge at any time from our user-friendly Ionic mobile app.

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get the battery of tomorrow, today

50%

50 percent lighter

0%

zero maintenance

200%

2x the power

500%

5x faster charging

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