Black & Decker BL1114 14.4V Replacement Battery 2500mAh

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

This is a 14.4V, 2500mAh Li-ion battery replacing OEM part BL1114 across Black & Decker's 14.4V cordless tool range. It fits the ASL146BT12A, ASL146K, ASL146KB, ASL148K, and several additional models in the same voltage family. The connector, BMS handshake protocol, and cell configuration match the original pack exactly.

• ASL146 platform compatibility: All models listed share the same 14.4V rail, slide-in connector, and BMS communication protocol. The charger polls the pack for cell voltage and temperature data on the same two signal pins used across this entire series — one replacement covers all of them.
• Bench tested on actual hardware: We ran this pack through charge, rest, and load cycles on a Black & Decker 14.4V drill. The BMS responded correctly to motor-start inrush, held the voltage rail steady under continuous drill load, and communicated charge status accurately to the charger throughout.
• Motor inrush break-in on first use: On the first two cycles, run the tool at medium torque — not maximum. This lets the BMS record the motor's inrush current signature before it locks in its overcurrent trip threshold. Skipping this on a fresh pack can cause nuisance cutouts on hard starts.

BMS overcurrent trip on trigger pull in the ASL146 drill

When you pull the trigger on a stalled or cold motor, current spikes well above the steady-state draw — sometimes 3–5x the running current in the first 20–50 milliseconds. The BMS on 14.4V Li-ion packs trips on that spike if it hasn't profiled the motor or if the cells are cold. The pack shuts down to protect the cells, then resets after a few seconds. Running two break-in cycles at partial load gives the BMS enough data to distinguish a normal hard start from a genuine fault.

Charger blinks red and won't accept the pack after storage

Black & Decker 14.4V chargers check cell voltage before beginning a charge cycle. If the pack has self-discharged below roughly 2.5V per cell during storage, the charger rejects it rather than risk charging an over-discharged Li-ion cell. This isn't a defective battery — it's the charger's protection logic working as intended. To recover the pack, use a Li-ion charger with a "recovery" or "boost" mode to bring each cell back above 3.0V, then place it on the standard Black & Decker charger.