The Auto 12V Auxiliary LFP Battery H5 is a 12.8-volt 60 amp-hour pack rated 800 cold-cranking amps, in the standard H5 case with an automotive BMS and sleep protection. It replaces the 12-volt lead battery an electric or hybrid car carries for its low-voltage systems.
The EV Problem
Why the 12V battery dies first
An electric car still runs its computers, locks, lights and contactors from a 12-volt battery, and that battery only gets charged through the DC-DC converter while the high-voltage system is awake. A car parked for two weeks gets no top-up at all. Sentry and security modes keep drawing the whole time, and the converter stops feeding the 12-volt side when the traction pack falls below roughly twenty percent. The lead battery fitted from the factory is small, cycles deeply on that standby load, and sulfates.
What Changes
A pack built for the duty
This pack handles that pattern. It holds 768 watt-hours against the 30 to 40 a small lead auxiliary battery gives usefully, it accepts thousands of shallow cycles rather than a few hundred, and it loses 2 to 3 percent a month sitting idle. The sleep-protection circuit drops the pack into a low-draw state during long parking and wakes it on the converter.
Cranking
800 amps for combustion cars
The same case suits a conventional car. 800 cold-cranking amps start a petrol or small diesel engine, and the 8.5-kilogram pack replaces a 17 to 19-kilogram lead unit in the same H5 tray.
Before Fitting
Battery sensors and registration
Some vehicles run a monitoring sensor on the negative lead and adapt their charging to a stored battery type. Those cars expect a lead profile and want the new battery registered through the service procedure after a change. Check what the vehicle asks for before fitting, and confirm the charging voltage at the terminal stays inside the 14.6-volt limit.
Data
Datasheet
| Model | ST12-60 |
|---|---|
| Nominal voltage | 12.8V |
| Capacity | 60Ah |
| Energy | 768Wh |
| Charge voltage | 14.6V |
| Continuous discharge | 60A |
| Cold cranking | 800A (CCA) |
| Cycle life | ≥3,000 cycles |
| BMS | Automotive grade, sleep protection |
| Weight | ≈8.5 kg |
| Case | H5 / DIN |
| Dimensions | 242 × 175 × 190 mm |
| Operating temperature | Discharge -20~60°C / Charge 0~45°C |
| Protection rating | IP65 |
| Certification | UN38.3 / CE / FCC |
Fit
Charging
The car’s converter or alternator charges the pack in service. For a bench charge use a lithium charger at 14.6 volts. Confirm the vehicle does not run a pulsed lead-recovery charge routine before fitting.
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