48-11-0140 Milwaukee 12V Cordless Drill Replacement Battery 1500mAh

Milwaukee 0401-1 / 0407-22 Series — 12V Ni-MH Replacement Battery (48-11-0140)

This is a 12V, 1500mAh Ni-MH battery pack for Milwaukee cordless drill/drivers across the 0401 and 0407 series. It replaces OEM part numbers 48-11-0140, 48-11-0141, 48-11-0200, and 48-11-0251. Fits over 25 Milwaukee 12V platform tools that share the same slide-in pack form factor and contact rail.

• 12V platform compatibility: The 0401, 0407, and related Milwaukee 12V models share a common battery rail voltage, contact layout, and BMS handshake protocol. Any pack in this family uses the same charge and discharge logic, so one pack works across the whole lineup without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a 0401-1 drill. The BMS held stable under repeated trigger pulls, and charge acceptance matched OEM spec within normal tolerance across both slow and fast charger modes.
• Ni-MH break-in on the 12V drill platform: On first use, run the drill at half load for two cycles before maximum torque applications. This allows the BMS to profile the motor inrush current draw and set accurate overcurrent thresholds before you push the pack hard.

BMS cutoff on motor-start inrush during trigger pull

When you pull the trigger on a Milwaukee 12V drill, the motor draws a spike of current before it reaches running speed. On a new or cold Ni-MH pack, the BMS may read that inrush spike as an overcurrent event and cut the pack out instantly. This is more likely on stiff chuck loads or when driving large-diameter bits into hardwood. Running two light-load cycles first lets the BMS learn the motor's start signature and raises the trip threshold to realistic levels.

Charger shows blinking red light and never accepts the pack

A blinking red light on Milwaukee 12V chargers usually means the cell voltage has dropped below the charger's acceptance floor — common after the pack has sat unused for several months. Ni-MH packs self-discharge faster than Li-ion and can fall below the charger's minimum detection threshold during storage. To recover the pack, some Milwaukee chargers have a reconditioning mode; if yours does not, briefly connecting the pack to a compatible slow charger for 10–15 minutes at low current can bring cell voltage above the acceptance threshold. Once the charger shows solid green or a normal charge indicator, the pack is recovering correctly — target a resting voltage of at least 12.0V before normal use.