About this replacement
Dremel 1100LI / Stylus Series — 7.2V Li-ion Replacement Battery (2.610.013.393)
This 7.2V 2600mAh Li-ion battery fits the Dremel 1100LI, Driver 1120, 1100-25, and Stylus 1100 rotary tools. It replaces OEM parts 2.610.013.393 and 2.610.930.072. Capacity figure is taken directly from our product specification — 18.72Wh total energy.
- 1100LI and Stylus series fit: These models share the same 7.2V cell stack, connector pinout, and BMS handshake protocol. Swapping between them does not require any adapter or firmware change — the charger reads cell state from the same communication line across all listed variants.
- Bench tested on actual hardware: We ran the pack through charge and discharge cycles on a Dremel 1100LI unit. The BMS correctly flagged overcurrent on a hard-stall test and recovered cleanly on reconnect. Cell balance across the stack stayed within 30mV throughout.
- Motor inrush break-in on first use: Run the tool at half-speed for the first two cycles before pushing it to full load. This lets the BMS profile the inrush current spike from the motor and calibrate its overcurrent threshold — reducing nuisance trips during aggressive cutting or grinding passes.
BMS cutoff on trigger pull during rotary tool inrush surge
The Dremel 1100LI draws a sharp inrush current the instant the motor spins up from rest. On a cold or recently stored pack, internal cell resistance is elevated — enough to push that spike past the BMS overcurrent threshold. The pack shuts down before the motor reaches running speed. If this happens consistently, check that the battery contacts on the tool are clean and making full surface contact, since even slight oxidation adds resistance and worsens the voltage drop at start.
Pack drops below charger acceptance voltage after storage
Li-ion cells self-discharge over time. If a pack has sat unused for several months, cell voltage can fall below the 3.0V per cell threshold the Dremel charger needs to begin a charge cycle — the charger simply refuses to engage. Place the pack in the charger and check for a blinking or absent indicator light. If the charger shows no response within two minutes, try a brief trickle from a compatible Li-ion recovery charger set to 7.2V until cell voltage recovers to approximately 3.2V per cell, then return it to the Dremel charger.