Packard Bell SE DOTSE-21G16iws Compatible Battery 11.1V 4400mAh

Packard Bell SE DOTSE-21G16iws — 11.1V Li-ion Replacement Battery

This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Packard Bell EasyNote SE DOTSE-21G16iws and related Dot SE/S series laptops. It replaces the original cell when capacity has dropped to the point where the laptop no longer holds a usable charge away from mains power. Fits the SE DOTSE-21G16iws, Dot SE/R-111UK, Dot S/B-003 IT, Dot S/B-017UK, and one additional variant.

• Dot SE and Dot S series fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — 203.70 x 53.52 x 40.00mm form factor with an identical cell voltage rail at 11.1V nominal across the whole range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the EasyNote platform and confirmed the BMS communicates correctly with the BIOS — charge acceptance, cutoff, and state-of-charge reporting all behaved as expected without triggering fault flags.
• First-use calibration on EasyNote: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that commonly appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after swap

The EasyNote BIOS stores health metrics from the previous cell in its battery EEPROM. When a new cell goes in, the BIOS compares live readings against that stored data and flags a mismatch as poor health. This is not a fault with the replacement cell — it is stale EEPROM data from the old battery. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% forces a learn cycle that overwrites the old values. After one or two of these cycles, the health status clears.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual chemistry. The displayed percentage is based on the old cell's discharge curve, so the reading diverges from real voltage under load. When the CPU and display draw full power simultaneously, the cell voltage drops below the BMS cutoff threshold before the gauge reaches 0% — causing an abrupt shutdown. Run two to three full discharge-to-cutoff and charge-to-100% cycles to let the fuel gauge IC recalibrate. After calibration, the shutdown threshold should align with a displayed level below 5%.