Kress 12V KU202 Replacement Battery 2000mAh Li-ion

Kress KU202 / KU203 / KU362 — 12V Li-ion Replacement Battery

This is a 12V 2000mAh (24Wh) Li-ion replacement battery for the Kress KU202, KU203, and KU362 cordless tool series. These compact drills and drivers run on a shared 12V platform with a common battery slot and connector. Capacity is sourced from product data — 2000mAh matches the original specification for these models.

• KU202 / KU203 / KU362 platform fit: These three models share the same 12V rail voltage, battery slot dimensions, and BMS communication protocol. One battery covers all three tools without adapters or wiring changes.
• Bench tested on actual hardware: We ran charge-discharge cycles on the KU202 platform and logged BMS behaviour across trigger-pull inrush events. The BMS held steady through repeated motor-start spikes without false overcurrent trips.
• Motor inrush conditioning on first use: On the first two cycles, run the drill at half load before going to maximum torque. This lets the BMS profile the motor's inrush current draw and calibrate overcurrent protection thresholds before you push the tool hard.

BMS cutoff on KU202 motor-start inrush surge

The KU202's compact motor produces a short but steep current spike the moment you pull the trigger. If the battery BMS has not yet profiled this inrush pattern — common with a fresh pack straight from storage — it can interpret the spike as an overcurrent fault and cut power instantly. This is not a faulty battery. The BMS resets automatically once the pack is removed and reseated. Running two half-load cycles first conditions the BMS threshold to the actual motor draw and prevents repeat trips.

Tool bogs under load and loses torque mid-operation

Sustained heavy drilling causes both the motor and the cells to generate heat in the same enclosed housing. As cell temperature rises, internal resistance increases, and the voltage rail sags under load — the tool feels underpowered even though the battery shows charge. Check the contact rails on the battery and tool for oxidation or debris, as high contact resistance amplifies voltage sag at the terminals. Clean the contacts with a dry cloth, reseat the pack firmly, and confirm the resting voltage reads at least 12.0V before continuing work.