12V LiFePO4 Batteries

The 12V LiFePO4 battery is the direct, lighter, longer-lived drop-in for a 12V lead-acid bank — CMX Battery builds them with an integrated BMS so your RV, boat or solar setup just works.

Overview

A 12V LiFePO4 battery runs at 12.8V nominal (four cells in series) and replaces a 12V AGM/GEL bank with a quarter of the weight, far deeper usable depth of discharge and 3–5× the cycle life. CMX Battery builds 12V packs with an integrated BMS, standard terminals and the capacity your RV, trolling motor, solar or mobility application needs. The catch buyers miss: a LiFePO4 bank wants a lithium-profile charger and a DC-DC or MPPT that supports LFP — we spec that alongside the battery so the system is correct end to end.

Key specifications

Specification	Value	Why it matters
Nominal voltage	12.8V (4 cells in series)	Drops into 12V systems; use a lithium charger profile.
Capacity	100Ah typical; 50–300Ah available	Deep usable DoD vs lead-acid.
BMS	Integrated, full protection	Over/under-voltage, current, temp.
Weight	≈1/4 of equivalent lead-acid	Major benefit for mobile use.
Cycle life	2,000–5,000 cycles	3–5× lead-acid.

Typical applications

RV and camper: House bank, lighter and deeper.
Marine and trolling: 12V cranking and house.
Solar and off-grid: Small 12V banks.
Mobility and mobility scooters: Drop-in replacement.

How to specify & buying guide

Use a charger/DC-DC/MPPT with a LiFePO4 profile — a lead-acid charger will under- or over-charge the bank.
Size Ah from daily kWh ÷ 12.8V, and allow for the higher usable DoD (80–90%) vs lead-acid (50%).
Keep cable and fuse ratings for the higher LiFePO4 current capability.
For cold charging, ask about low-temperature or self-heating variants.

Engineering & manufacturing at CMX Battery

Our modules pair matched LiFePO4 cells with a purpose-built BMS, busbars and mechanical enclosure. We design for the thermal and vibration profile of the application — stationary rack, wall mount or mobile pack — and validate the assembly on capacity, IR balance and thermal runaway margin before it ships.

Certifications & compliance

UN38.3 — Mandatory lithium battery transport test (altitude, thermal, vibration, shock, external short). Required for any cross-border shipment.
IEC62619 — International safety standard for industrial Li-ion cells and batteries; expected by EU and most APAC buyers.
CE — EU declaration of conformity for the applicable directives.
RoHS — Restriction of hazardous substances in the battery and BMS.
IP65 — Dust-tight and low-pressure water-jet resistant — suitable for outdoor enclosures.

Frequently asked questions

Will it replace my lead-acid battery directly?

Electrically yes at 12.8V, but your charger, DC-DC and solar controller should support a LiFePO4 profile.

How long does it last vs lead-acid?

Typically 2,000–5,000 cycles vs 300–500 for lead-acid — 3–5× the life.

Can I use my existing inverter?

Most 12V inverters work; confirm low-voltage cutoff matches LFP (≈10–11V), not lead-acid.

What capacity should I choose?

Daily kWh ÷ 12.8V, sized to 80–90% DoD; we can size it from your load list.

Request a quote

Send us your voltage, capacity, dimensions, certification target and annual volume. Our engineering team returns a proposal within three working days. Start your RFQ or review our custom pack capabilities.