12V Craftsman 11102 Ni-MH Replacement Battery 3000mAh

Craftsman 315.22411 Series — 12V Ni-MH Replacement Battery (11102 / 981078-001)

This is a 12V, 3000mAh Ni-MH battery pack for Craftsman cordless power tools including models 315.22411, 315.224110, 9-27137, and 9-27139. It replaces OEM part numbers 11102 and 981078-001. The pack slots into the original battery bay and connects via the factory terminal block.

• 315.22411 series compatibility: These models share a common 12V battery bay geometry, terminal pitch, and BMS handshake protocol. The charger reads cell temperature via a thermistor line on the pack — this replacement includes that thermistor so the charger completes its charge cycle correctly.
• Bench tested on actual hardware: We ran this pack through a drill and a sander on the 315-series platform. The BMS handled motor-start inrush correctly on the drill trigger pull without tripping overcurrent protection, and cell voltage held stable across sustained sander load cycles.
• Break-in on first use: On first use, run the tool at half load for two cycles before full-torque applications. This allows the BMS to profile the motor inrush draw and calibrate its overcurrent thresholds before you hit peak demand tasks like driving lag bolts or cutting through hardwood.

BMS cutoff on motor-start inrush surge with the 315-series drill

When you pull the trigger on a Craftsman 12V drill under load, the motor draws a spike of current — often 3× to 5× the running current — in the first 50–100 milliseconds. If the BMS overcurrent threshold is set too conservatively, or if cell impedance is elevated after storage, the pack shuts down instantly on that spike. Ni-MH chemistry handles inrush better than Li-ion because it tolerates higher peak discharge rates without BMS intervention. However, a pack that has sat discharged for months will have higher internal resistance, making inrush trips more likely until the cells are cycled back to normal impedance.

Charger blinking or refusing to start on a new pack out of the box

Craftsman 12V chargers check for a minimum cell voltage before starting a charge cycle. If the pack has been in storage, individual cells can drift below the charger's acceptance threshold — typically around 1.0V per cell, or roughly 10V at the pack level. The charger sees this as a fault condition and blinks instead of beginning the charge. To recover, use a compatible charger with a recovery or conditioning mode, or briefly apply a trickle charge externally to bring the pack voltage above 10.8V — then seat it back in the Craftsman charger and it will begin a normal cycle.