About this replacement
LUX-TOOLS ABS 12Li 396951 — 10.8V Li-ion Replacement Battery (ABS 12Li)
This is a 10.8V 2000mAh Li-ion replacement battery for the LUX-TOOLS ABS 12Li cordless drill/driver (model 396951). It fits the original battery slot and runs the same voltage rail as the factory pack. Capacity is 2000mAh (21.6Wh), matching the OEM specification.
- ABS 12Li 396951 platform fit: The 396951 drill uses a 10.8V pack with a specific four-contact connector and BMS handshake. This replacement matches that connector pinout and communicates with the tool's onboard protection circuit so the trigger-pull current limit functions as intended.
- Bench tested on actual hardware: We ran this pack through motor-start inrush cycles on a 10.8V drill platform. The BMS held the overcurrent threshold correctly on repeated trigger pulls and returned to standby without tripping into lockout.
- Break-in on the ABS 12Li: On first use, run the drill at half load — light fastening, no torque-limit screwdriving — for two full charge cycles before driving into hardwood or using maximum clutch settings. This lets the BMS profile the motor's inrush draw and set overcurrent thresholds accurately before heavy use.
BMS cutoff on motor-start inrush in the ABS 12Li
Every trigger pull on a compact drill produces a current spike — the motor demands peak amperage in the first milliseconds before it reaches running speed. On a new or recently stored pack, the BMS may read that spike as an overcurrent fault and cut the output before the motor turns. This is more common when the cell voltage is below 11V after storage. If the tool clicks and goes dead on trigger pull, put the pack on the charger for a full cycle first, then retry at half load.
Charger not recognising the pack after storage
Li-ion cells that sit unused for several months can drop below the charger's acceptance voltage threshold — typically around 2.5V per cell. When that happens, the charger blinks an error or shows no activity instead of starting the charge cycle. Remove the pack, wait 60 seconds, and reinsert it to prompt the charger to retry. If it still won't accept the pack, check the terminal voltage with a multimeter — a reading below 8V across the pack terminals means the cells have discharged past safe recovery.