About this replacement
Craftsman 10126 Series — 19.2V Ni-MH Replacement Battery (11375)
This is a 19.2V 3000mAh Ni-MH replacement battery for Craftsman cordless power tools. It fits the 10126, 11541, 11543, 11570, and over 18 additional Craftsman models sharing the same 19.2V platform. Capacity is 3000mAh (57.6Wh), matching the original pack specification.
- 19.2V platform compatibility: The 10126 and its sibling models share a common 19.2V cell stack, connector pinout, and BMS handshake. Any model on this voltage rail accepts the same physical and electrical interface — no adapter needed.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a 19.2V Craftsman drill. The BMS held current limits correctly across trigger-pull inrush spikes and sustained load draws without nuisance trips.
- Break-in procedure for motor tools: On first use, run the drill at half load for two full discharge-charge cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and set overcurrent thresholds accurately before hard use.
BMS cutoff on trigger-pull inrush surge in the 10126 drill
When you pull the trigger on a Craftsman drill, motor start current spikes to three or four times the running draw for a fraction of a second. A Ni-MH BMS that hasn't profiled the motor load yet can read that spike as an overcurrent fault and cut the pack immediately. This is most common on a new or storage-recovered battery in a tool with a worn armature, because a damaged armature draws higher inrush. If the cutout happens only at trigger-pull and not under sustained running load, the fault is inrush-related, not thermal.
Tool bogs and loses torque under sustained drilling load
Voltage sag under load is the most common symptom in aging or heavily cycled Ni-MH packs. As internal cell resistance rises, the pack voltage drops under draw — the tool slows and loses torque even though the battery reads charged at rest. Check the battery rail contacts first: oxidised or pitted contacts add resistance before current even reaches the cells. If contacts are clean and the sag persists, measure pack voltage under load — a healthy 19.2V Ni-MH should hold above 17V at moderate drill load.