Most heavy-duty diesel trucks use a 2-battery or 4-battery bank wired in parallel to deliver the cold-cranking amps a big diesel engine needs. One IC-12V100-S12HD replaces roughly two lead-acid Group 31 batteries — its 3,000 CA / 1,800 CCA output exceeds what a pair of typical lead-acid Group 31 commercial batteries delivers together, and the 100Ah capacity handles the reserve needs of most single-engine truck applications.

For larger applications (4-battery banks on Peterbilt/Freightliner/Kenworth with high-draw sleeper accessories, or heavy yellow iron equipment with large starter motors), you can wire two IC-12V100-S12HD batteries in parallel to get 6,000 CA / 200Ah — matching what a 4-battery lead-acid bank does at a fraction of the weight (~61 lbs of lithium vs ~300 lbs of lead-acid).

Rule of thumb:

• 2× lead-acid Group 31 bank → 1× S12HD (weight savings ~90 lbs)
• 4× lead-acid Group 31 bank → 2× S12HD in parallel (weight savings ~180 lbs)

If you’re unsure about your specific setup, call 704-360-9311 with your truck/equipment year, make, and current battery bank configuration.

No modification required for most modern diesel trucks. The S12HD’s built-in Battery Management System (BMS) regulates charge acceptance and protects the battery from overvoltage. Standard 24V/28V-nominal heavy-duty alternators (which output 27-29V for a 2-battery series bank, or 13.8-14.4V per battery in parallel banks) charge the S12HD safely at the recommended 14.6V ceiling.

Concerns to verify before install:

• Alternator output above 14.8V: If your alternator regulator is set high (common on some older mechanical-regulated units and some aftermarket high-output alternators), have it verified/adjusted to 14.4-14.6V. The BMS will protect the battery from occasional spikes but sustained overvoltage triggers protective shutdown and shortens life.
• Isolators and multi-battery relays: Modern smart isolators work fine. Older diode-based isolators drop 0.5-0.7V and may prevent full charge — if using one, verify your battery sees 14.4V+ at the terminals during alternator run.
• Direct-drive generator sets: If this battery is used on a residential or commercial standby generator, verify the generator’s charge circuit doesn’t hold a lead-acid-specific 13.4V-13.6V float continuously (this is fine for occasional maintenance charging, but not ideal for continuous float over months of standby).

The Ionic app shows real-time charge voltage — connect via Bluetooth and confirm your charging system delivers 14.0-14.6V during operation before deploying to fleet service.

Better than lead-acid — but plan for it.

The S12HD self-discharges at less than 3% per month on its own, which means the battery itself will still be at 80%+ after 6 months of pure storage. The problem in diesel trucks is parasitic drain from onboard electronics — modern trucks with telematics units, keyless entry, alarms, and always-on ECMs can pull 30-100 mA continuously, which adds up to 20-70Ah per month depending on the load.

A 100Ah S12HD sitting on a truck with 50 mA parasitic drain would drop to BMS cut-off in roughly 2-3 months — better than a comparable lead-acid setup which typically drops below cranking voltage in 3-5 weeks, but not indefinite.

Options for long-term storage:

• Use the anti-theft / battery-off feature via the Ionic app to disconnect the battery when you park it. Reconnect via app or manually before startup.
• Install a battery disconnect switch at the negative terminal — traditional solution, works for any battery type.
• Connect a solar maintainer or trickle charger — the Ionic 12V 2A Trickle Charger (linked in Related Products) is designed for this use case.
• Emergency Start reserve provides insurance — even if the battery drains further than expected, the 25% reserve is still available for at least one crank via button/app.

Fleet operators who cycle trucks through weekly service typically don’t hit this — the concern is seasonal equipment (dump trucks, snow plows, backup generators) sitting idle for months.

Yes — the heater is designed to bring the battery into its charging temperature range (32°F / 0°C and above) automatically when the battery detects it’s cold and sensing incoming charge current. This lets the battery accept a charge even in Northern-tier winter conditions where lead-acid batteries would need to be pulled inside and warmed up first.

What the heater does:

• Detects cell temperature via internal sensor
• Activates automatically below 32°F when charge current is present
• Warms cells to safe charging threshold before accepting current
• Deactivates once cells reach normal operating range
• Powered by the incoming charge current itself — doesn’t drain the battery to heat

What the heater doesn’t do:

• Continuous heating when the battery is just sitting (no incoming charge)
• Full pre-heating for cranking — the S12HD can crank even at cold soak temps (per the -20°C / -4°F operating range spec) because LiFePO4 handles brief high-current discharge in cold conditions

Real-world cold-start behavior at -30°F:

• Battery cranks the engine on the discharge side (rated to -4°F, but will typically crank below spec for the short duration of a diesel start)
• Alternator kicks in once engine starts
• Heater activates as alternator delivers charge current
• Battery warms and begins accepting charge within a few minutes of engine run
• Fully replenished by the time you reach cruising temperature

For truly extreme applications (Alaska pipeline, Northern Canada oil field, Antarctic research), a battery blanket or engine block heater is still a good idea — but for typical Midwest/Northeast/Rocky Mountain winter conditions, no external heating is required.

The IC-12V100-S12HD is covered by a 5-year full replacement warranty — not pro-rated, not depreciated. If the battery fails under normal use within 5 years, LithiumHub replaces it at no charge. That applies to commercial and fleet buyers as well as individual owners.

What the warranty covers:

• Manufacturing defects
• BMS failure
• Cell failure or capacity drop below spec
• Premature failure under specified operating conditions

What the warranty doesn’t cover:

• Physical damage from impact, crushing, or improper installation
• Overcharge damage from an alternator or charger outputting above 14.8V
• Use outside the -4°F to 140°F operating range
• Vehicle downtime, tow bills, or lost revenue from a failed battery (the warranty covers the battery, not consequential damage)

Fleet-specific process:

• Call 704-360-9311 (M-F 9AM-5PM EST) or email [email protected] to initiate a claim
• Have the SKU (IC-12V100-S12HD), date of purchase, and installation details ready
• Replacement units typically ship within 1-2 business days from Norris, SC
• For fleet buyers with 5+ batteries in service, contact sales to discuss dealer/commercial account terms that may include expedited replacement or on-site swap coordination

For high-value commercial applications where downtime cost exceeds battery cost, keeping a spare S12HD on hand is standard fleet practice — the same way you’d stock a spare alternator or starter.