The 12V 100Ah Dual-Purpose Start+Deep Cycle battery delivers 800 cold-cranking amps and 1,280 watt-hours of deep-cycle storage from one Group 31 case, on M8 terminals, rated IP65. It cranks an engine and runs the house loads from a single battery.
Two Jobs, One Battery
Crank and house together
A boat or a truck usually carries two batteries: a cranking battery for the engine and a house battery for the loads. A dual-mode BMS in this block does both. It delivers the 800-amp burst an outboard or a diesel needs to start, and it deep-cycles the 100 amp-hours for the fridge, lights and electronics between starts.
The Cranking Side
800 cold-cranking amps
800 cold-cranking amps start a mid-size gasoline or small diesel engine. LiFePO4 holds its voltage through the crank where a half-dead lead battery sags. The engine turns over fast even after a day of house use, and the alternator recharges the battery on the run.
The Limit
Where two batteries still win
One dual-purpose battery suits a single-engine boat or a truck with a modest house load. A large bank, a big inverter or twin engines still want a dedicated cranking battery and a separate house bank. Within its range, this block removes the second battery and its wiring.
Data
Datasheet
| Model | DC12-100D |
|---|---|
| Nominal voltage | 12.8V |
| Capacity | 100Ah |
| Energy | 1280Wh |
| Charge voltage | 14.6V |
| Discharge cutoff | 10V |
| Continuous discharge | 100A |
| Cold cranking | 800A (CCA) |
| Cycle life | ≥4,000 cycles @80% DOD |
| BMS | Start + deep-cycle dual mode |
| Weight | ≈12.2 kg |
| Case | BCI Group 31 |
| Dimensions | 328 × 172 × 215 mm |
| Terminals | M8 |
| Operating temperature | Discharge -20~60°C / Charge 0~45°C |
| Protection rating | IP65 |
| Certification | UN38.3 / CE / FCC / RoHS |
Fit
Charging
The battery charges at 14.6 volts off a lithium charger, an LFP solar controller or the vehicle alternator that also tops it after a crank.
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