Black & Decker BL1114 14.4V Cordless Drill Replacement Battery

Black & Decker ASL146BT12A Series — 14.4V Li-ion Replacement Battery (BL1114)

This is a 14.4V, 1500mAh Li-ion battery that replaces the OEM BL1114, BL1314, BL1514, and LB16 packs. It fits the Black & Decker ASL146BT12A and related cordless drill/driver models in the 14.4V platform. Same connector footprint and BMS handshake as the original pack.

• ASL146 platform compatibility: The ASL146BT12A, ASL146K, ASL146KB, and ASL148K all run the same 14.4V rail with the same slide-on connector and cell configuration. One battery SKU covers all of them because the BMS communication protocol and terminal layout are identical across the series.
• Bench tested on actual hardware: We cycled this pack on an ASL146K drill/driver, monitoring cell voltage under load and BMS response. The protection circuit held cutoff thresholds consistent with OEM spec — no false trips during repeated trigger pulls.
• Motor inrush break-in on first use: On first use, run the drill at half load for two cycles before applying full torque. This lets the BMS log the motor's inrush current signature and set overcurrent thresholds accurately — preventing nuisance cutoffs during heavy fastening later.

BMS cutoff on motor-start inrush surge in 14.4V drill/drivers

When you pull the trigger on a drill/driver, the motor draws a sharp inrush current — often three to five times the running load — before the rotor spins up. A new or freshly charged battery with a conservative BMS can interpret that spike as a fault and cut output instantly. The protection circuit needs at least one or two cycles to distinguish normal inrush from a genuine short-circuit event. If the drill cuts out the moment you pull the trigger, that is the BMS tripping, not a defective cell.

Tool bogs under load and feels weaker than the old battery

Voltage sag under load is the usual cause — the rail voltage drops enough mid-drill that the motor loses torque before the BMS hits its cutoff floor. First, check the slide contact rails on the battery and tool for debris or oxidation; high contact resistance amplifies sag significantly. If contacts are clean and sag persists, verify the pack resting voltage after a full charge is at or above 16.0V. A pack sitting below 15.5V fully charged has a cell imbalance that a standard charger will not correct on its own.