Lincoln 1861 18V Cordless Drill Replacement Battery 3000mAh

Lincoln LIN-1862 / PowerLuber Series — 18V Li-ion Replacement Battery (1861)

This 18V 3000mAh Li-ion battery replaces the Lincoln part number 1861 (also cross-references 25664) in the LIN-1862, LIN-1864, and PowerLuber Grease Gun. It slots into the same battery bay and connects to the same rail contacts as the original. Capacity is 3000mAh (54Wh) — taken from product data, not estimated.

• LIN-1862, LIN-1864, and PowerLuber compatibility: These three tools share the same 18V battery platform, connector pitch, and BMS handshake protocol. One battery works across all three without adapters or firmware changes.
• Bench tested on actual hardware: We ran this pack through repeated trigger-pull cycles on a cordless drill and a grease gun motor. The BMS held the overcurrent threshold consistently and did not trip on standard inrush loads. Cell voltage recovery between draws was within spec.
• Break-in for grease gun and drill motor loads: On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS profile the motor's inrush current draw before locking overcurrent protection thresholds — prevents nuisance trips during the first full working session.

BMS cutoff on trigger-pull inrush in drill and grease gun motors

When you pull the trigger on a brushed motor tool, current spikes sharply for 50–100 milliseconds before the motor reaches running speed. On an 18V pack, this inrush can hit three to four times the steady-state draw. A freshly installed or cold battery with a conservative BMS can read that spike as a fault and cut the pack before the motor fully starts. Running two half-load break-in cycles lets the BMS log the inrush profile and adjust its overcurrent window accordingly.

Tool bogs under sustained load after the battery shows full

If the tool starts strong but loses torque partway through a job, the most likely cause is voltage sag — cell voltage dropping under sustained draw faster than the indicator tracks. Check the rail contacts on both the battery and the tool for carbon buildup or corrosion; high contact resistance amplifies sag. Clean both contact surfaces with a dry cloth, reseat the pack firmly, and retest. If sag persists, check open-circuit voltage after a full charge — a healthy 18V Li-ion pack should read 20.0–20.5V off the charger.