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How To Choose An RV Solar Battery Charger: The Basics

How To Choose An RV Solar Battery Charger Wondering how to choose an RV solar battery charger? This is the post for you. They say the best things in life are free. That’s certainly true when it comes to powering your RV off grid. Instead of paying for earth-unfriendly generator […]

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Eco Friendly RV Tips: RV Solar Panels, Energy Efficient Batteries, and More

Eco Friendly RV Tips: RV Solar Panels, Energy Efficient Batteries, and More Does your eco friendly RV need to be more eco friendly? If so, you’re in the right place. You wouldn’t toss a bucket of bleach on your favorite houseplant. Or doodle on your brand new car with your […]

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One 36V Battery or Three 12V Batteries? Pros and Cons

One 36V Battery or Three 12V Batteries? Pros and Cons Years ago, when an application required 36 volts, the best option was to connect three 12V batteries in a series. But now that 36V batteries have shown up on the market, you might be wondering if using just one battery […]

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What’s a Deep Cycle Marine Battery? Plus Answers to Your Boat Battery Questions

What’s a Deep Cycle Marine Battery? Plus Answers to Your Boat Battery Questions As long as it seems to be doing its job, you might not give your boat battery much thought. In fact, many boat owners just use the batteries that came with their boats when they bought them. […]

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9 Ways To Use Your 12V Lithium Battery

9 Exciting Ways To Use Your 12V Lithium Batteries Gone are the days of hauling around hefty, bulky generators to power appliances in your RV. Or worse–going completely without power on a freezing night off-grid because you don’t have enough reserve. Lithium batteries have revolutionized the outdoor adventure industry. But […]

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LiFePO4 Batteries: What They Are and Why They’re the Best

LiFePO4 batteries are taking “charge” of the battery world. But what exactly does “LiFePO4” mean? What makes these batteries better than other types? Read on for the answer to these questions and more. What are LiFePO4 Batteries? LiFePO4 batteries are a type of lithium battery built from lithium iron phosphate. […]

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Portable Power Stations For Camping, Overlanding & Emergencies

Portable Power Stations For Camping, Overlanding & Emergencies Ahh…the great outdoors. An adventure outside the city is the perfect time to connect with nature and disconnect from our gadgets. But let’s get real here. Is that really possible? Your Guilty Pleasure (or Absolute Necessity) for All Off-Grid Adventures Today, it’s […]

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Lithium Trolling Motor Battery Advantages For Your Bass Boat

Lithium Trolling Motor Battery Advantages For Your Bass Boat Lithium trolling motor batteries. Are they all they’re cracked up to be? Let’s paint a bass-hunting sort of picture:  The big day has finally arrived. You’re off to the tournament, ready to hook a hefty one and knock out your competition. […]

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The Best RV & Travel Trailer Battery For Dry Camping & Boondocking

What is the best RV & travel trailer battery for dry camping and boondocking? Camping has been a favorite American pastime for generations. Who doesn’t like a peaceful weekend away? Especially when you have a roomy travel trailer (or other RV) to stretch your legs in. Over the years camping […]

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Discharge Rate And Lithium Batteries

The C-rate is a unit to declare a current value which is used for estimating and/or designating the expected effective time of battery under variable charge or discharge condition. The charge and discharge current of a battery is measured in C-rate. Most of portable batteries are rated at 1C. This means that a 1000mAh battery would provide 1000mA for one hour if discharged at 1C rate. The same battery discharged at 0.5C would provide 500mA for two hours. At 2C, the 1000mAh battery would deliver 2000mA for 30 minutes. 1C is often referred to as a one-hour discharge; a 0.5C would be a two-hour, and a 0.1C a 10-hour discharge. The capacity of a battery is commonly measured with a battery analyzer. If the analyzer’s capacity readout is displayed in percentage of the nominal rating, 100% is shown if a 1000mAh battery can provide this current for one hour. If the battery only lasts for 30 minutes before cut-off, 50% will be displayed. A new battery sometimes provides more than 100% capacity.

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Discharge Rate And Lithium Batteries

What’s C-rate?

The C-rate is a unit to declare a current value which is used for estimating and/or designating the expected effective time of battery under variable charge/discharge condition. The charge and discharge current of a battery is measured in C-rate. Most of portable batteries are rated at 1C. This means that a 1000mAh battery would provide 1000mA for one hour if discharged at 1C rate. The same battery discharged at 0.5C would provide 500mA for two hours. At 2C, the 1000mAh battery would deliver 2000mA for 30 minutes. 1C is often referred to as a one-hour discharge; a 0.5C would be a two-hour, and a 0.1C a 10-hour discharge. The capacity of a battery is commonly measured with a battery analyzer. If the analyzer’s capacity readout is displayed in percentage of the nominal rating, 100% is shown if a 1000mAh battery can provide this current for one hour. If the battery only lasts for 30 minutes before cut-off, 50% will be displayed. A new battery sometimes provides more than 100% capacity. When discharging a battery with a battery analyzer that allows the setting of different discharge C-rates, a higher capacity reading is observed if the battery is discharged at a lower C-rate and vice versa. By discharging the 1000mAh battery at 2C, or 2000mA, the analyzer is scaled to derive the full capacity in 30 minutes. Theoretically, the capacity reading should be the same as with a slower discharge, since the identical amount of energy is dispensed, only over a shorter time. Due to internal energy losses and a voltage drop that causes the battery to reach the low-end voltage cut-off sooner, the capacity reading may be lowered to 95%. Discharging the same battery at 0.5C, or 500mA over two hours may increase the capacity reading to about 105%. The discrepancy in capacity readings with different C-rates is related to the internal resistance of the battery.

To calculate of load current value with charge/discharge rate, it can be obtained by;

∴ C-Rate (C) = Charge or Discharge Current (A) / Rated Capacity of Battery

Also, expected available time of the battery on given discharge capacity can be obtained by;

∴ Used hour of the battery = Discharge capacity (Ah) / Discharge current (A)

Discharge Capability of high power Lithium cell.

[Example] In High Power products, rated capacity of SLPB11043140H model is 4.8Ah. A Lithium-ion NMC cell.

1. What is 1C discharge current condition at this model?

∴ Charge (or discharge) Current (A) = Rated capacity of the battery * C-rate = 4.8 * 1(C) = 4.8 A

It’s means the battery is available for 1 hour by this current discharge condition.

2. The discharge current value under 20C discharge condition is 4.8(A)*20(C)=96A This battery reveals the excellent performance even if the battery discharges 20C discharge condition. The following is the available time of the battery when the capacity of battery shows 4.15Ah

∴ Used hours (h) = Discharged capacity(Ah) / Applied current(A) = 4.15(Ah) / 96(A) ≒ 0.043hours ≒ 2.6 minutes with 96A

It means the battery can be use for 2.6minute (0.043h) with load current of 96A

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