What it does
Drop-in 12 V / 100 Ah lithium iron phosphate house battery in a Group 31 case, with the BMS built in. The BMS allows 100 A of continuous discharge, tolerates a 200 A surge for up to 30 seconds, and accepts up to 50 A of charge.
BB10012
Battle Born 100Ah
100Ah LiFePO4 with internal BMS, Group 31 size. 100A continuous discharge with a 200A 30-second surge; charge at up to 50A.
This part has no feed of its own to size, so its cables are sized from the complete system topology once you draw what it connects to.
Wiring diagram
How the 100Ah LFP is wired.
The drawing shows where the feed, the return and the fuse land on this part. The starter uses the same reference circuit and sizing assumptions. Read the installation notes for manufacturer requirements before adapting the runs.
Build it out
Build the system it goes in.
Open the canvas with BB10012 already placed, then add your batteries, charging, distribution and loads around it.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Specs, terminals and the parts around them.
The catalog facts for this part, which terminal takes what, and the hardware you'll want around it. Check the nameplate on your own unit before you order.
Catalog specification
- Nominal voltage
- 12.8 V
- Capacity
- 100 Ah
- Maximum discharge
- 100 A
Supporting parts
- A lug or terminal to match each post on the part
- Strain relief and boots so nothing chafes or shorts
- Cable and fuses sized once the whole system is drawn
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
pos
positive · bidi
−
neg
negative · bidi
Field notes
How it actually goes in.
What we've read and heard about installing this exact part. These are notes, kept apart from the numbers Crimp works out.
Wiring it
Wires like any 12 V battery: positive feed through a fuse close to the post, negative return to the system bus, and interconnects sized for the whole bank's current when batteries are paralleled. Lithium charge profiles are expected from every source — alternator charging goes through a DC-DC charger rather than a direct feed.
What people get wrong
Sizing an inverter against one battery's BMS limit. A 12 V inverter pulling 1500 W draws well over the 100 A a single BB10012 will deliver continuously — the BMS disconnects under a load the inverter is rated to carry. Big inverter loads need the bank paralleled until the combined continuous rating covers the draw, with interconnects sized for the total.
Supporting parts
- Class-appropriate fuse at the positive post, sized to the wire it protects
- A DC-DC charger for alternator charging with a lithium profile
- Interconnect cables sized to the whole bank's current when paralleling
Verified against the manufacturer's documentation (rev. 2024-05), checked 2026-08-01. Manufacturer documentation →
Method & provenance
What is known, assumed and computed.
The manufacturer publishes some of these numbers and Crimp works out the rest. It's worth knowing which is which.
From the maker
What the catalog says
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
What Crimp worked out
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Draw the 100Ah LFP into your own system.
It lands on the canvas already placed. Add what it connects to, and every run gets its wire and fuse as you draw.