Craftsman 11147 Ni-MH Replacement Battery 13.2V 1500mAh

Craftsman 11147 / 27493 / 315.224530 — 13.2V Ni-MH Replacement Battery (11064)

This is a 13.2V, 1500mAh Ni-MH replacement battery for Craftsman cordless power tools. It fits the 11147, 27493, and 315.224530 models and replaces OEM part numbers 11064, 11095, 981090-001, and 981563-000. The connector and cell count match the original pack exactly.

• 11147, 27493, and 315.224530 compatibility: These three models share the same 13.2V battery rail, pack housing dimensions, and terminal layout. The BMS handshake protocol is identical across all three, so one pack covers the full group without modification.
• Bench tested on actual hardware: We ran this pack on a 315.224530 drill through repeated trigger-pull cycles. The BMS held stable through motor-start inrush spikes without tripping. Cell temperature stayed within spec across the full discharge curve.
• Ni-MH break-in on high-torque tools: Run the drill or driver at half load for the first two cycles before pushing full torque applications. This lets the BMS profile the inrush current draw from the motor and calibrate overcurrent protection thresholds before you put the tool under maximum stress.

BMS cutoff on motor-start inrush with cordless drills

When you pull the trigger hard on a drill or impact driver, the motor draws a sharp current spike before it reaches running speed. On a new or cold Ni-MH pack, the BMS may read that spike as an overcurrent event and cut power immediately. This is more likely if the pack has been sitting unused — internal resistance is higher when cells are not in an active charge cycle. Two partial discharge-and-charge cycles at moderate load will lower that resistance and shift the BMS trip threshold back into normal range.

Tool bogs under load and recovers when you release the trigger

If the drill loses torque mid-cut but comes back as soon as you ease off the trigger, the cause is voltage sag — the pack's output voltage drops under sustained current draw faster than the motor can compensate. On Ni-MH cells, rail contact resistance at the terminal pads is the first thing to check. Clean the battery terminals and tool contacts with isopropyl alcohol and a firm swab, then measure resting voltage — a healthy 13.2V pack should read between 13.0V and 14.4V after a full charge.