YILI YLD01-20V2AH 18V Cordless Drill Compatible Battery 2000mAh

YILI YLQ2010D-B — 18V Li-ion 2000mAh Replacement Battery (YLD01-20V2AH)

This is an 18V lithium-ion replacement battery rated at 2000mAh (36Wh) for the YILI YLQ2010D-B cordless power tool platform. It fits drills, impact drivers, saws, and other tools in the YLQ2010D-B line that accept the YLD01-20V2AH pack. Slot it into any compatible charger and tool the same way you would the original.

• YLQ2010D-B platform fit: Tools across this line share the same 18V nominal rail, slide-in connector, and BMS handshake protocol — that is why one pack works across drills, drivers, and saws without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a YLQ2010D-B drill, confirmed BMS overcurrent protection tripped and reset correctly, and verified cell balance across all nodes stayed within spec.
• Break-in load discipline: On first use, run the tool at half load for two cycles before maximum torque applications. This lets the BMS profile the motor inrush current draw and set accurate overcurrent thresholds before you push the pack hard.

BMS cutoff on motor-start inrush surge

When you pull the trigger on a drill or circular saw, motor inrush current spikes sharply — often two to four times the running current — in the first few milliseconds. A new pack's BMS uses conservative factory thresholds until it has seen a few full cycles. If the BMS reads that spike as a fault, it cuts the output rail and the tool stops dead at trigger pull. Running two half-load break-in cycles teaches the BMS the normal inrush profile for your specific motor so it stops misreading startup draws as overcurrent faults.

Tool bogs under load even with a fully charged pack

A fully charged pack that still makes the tool feel sluggish under load usually points to voltage sag from high contact resistance — not cell failure. Dirt, oxidation, or a loose rail connection at the battery terminal adds resistance that drops the voltage under draw. Clean the battery contacts and the tool's terminal rails with isopropyl alcohol and a firm brush. After cleaning, check the pack voltage under light load with a multimeter — it should hold above 17V; anything below that points to worn cells rather than a contact issue.