Uniropa KT-250 BP-72 7.2V Ni-MH Replacement Battery 1500mAh

Uniropa KT-250 BP-72 — 7.2V Ni-MH Replacement Battery

This is a 7.2V, 1500mAh Ni-MH replacement battery for the Uniropa KT-250 BP-72 cordless drill and impact driver. It slots into the original battery housing and restores full tool operation for drilling, driving, and fastening tasks. Capacity is rated at 10.8Wh — matching the original pack specification.

• KT-250 BP-72 platform fit: The KT-250 BP-72 runs a 7.2V rail with a fixed connector footprint. This cell pack matches that voltage tier and connector geometry, so the tool's power delivery and trigger response behave as expected under normal load.
• Bench tested on actual hardware: We cycled this pack through repeated trigger-pull events on a 7.2V drill platform and monitored the BMS response to motor-start inrush current. The protection circuit held stable through repeated cold starts without nuisance trips.
• First-cycle load conditioning: Run the tool at half load — light drilling, small fasteners — for the first two cycles before applying maximum torque. This lets the BMS log the motor's inrush current signature and set accurate overcurrent thresholds before heavy use begins.

BMS cutoff on motor-start inrush in the KT-250

When you pull the trigger on a cordless drill, the motor draws a short spike of current — often three to five times the running current — before it reaches operating speed. On a fresh or cold pack, the BMS may read that spike as an overcurrent fault and cut the output. The KT-250 BP-72's compact housing keeps the cells close to the motor, which means heat from both sources accumulates quickly during back-to-back fastening runs. If the BMS trips, release the trigger, wait ten seconds, and restart at a lower torque setting to allow the protection circuit to reset.

Tool bogs under load and loses torque mid-screw

This symptom points to voltage sag — the cell voltage drops under load faster than it should. The most common cause in Ni-MH packs is high contact resistance at the battery rail terminals, either from corrosion or debris on the contact pads. Clean the contacts on both the battery and the tool with isopropyl alcohol and a cotton swab, then test under load again. If the sag persists, check the resting voltage with a multimeter — a fully charged 7.2V Ni-MH pack should read at least 8.5V open-circuit before use.