3GEN DL2B Dermatoscope Compatible Battery 3.7V 1150mAh

3GEN DL2 / DL3 Dermatoscope — 3.7V Li-Polymer Replacement Battery (DL2B)

This is a 3.7V, 1150mAh Li-Polymer cell that replaces the original DL2B battery in the 3GEN DL2 and DL3 Dermatoscope series, including DermLite II and DermLite III models. It fits the same form factor — 48.00 x 33.12 x 7.00mm — and connects to the same BMS contact points. Voltage and capacity match the OEM specification exactly.

• DL2, DL3, DermLite II and III compatibility: These models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake protocol is identical across the series, so one cell covers all four platforms without modification.
• Bench tested on actual hardware: We cycled this cell through charge, standby, and draw phases on the DL2 platform. The BMS accepted the cell on first insertion, completed voltage verification without fault flags, and held stable output through the full load profile.
• Post-installation self-test protocol: After fitting this cell, let the dermatoscope complete its full power-on self-test without interruption. The BMS runs a chemistry verification at startup — cutting power mid-sequence writes a false battery fault that persists until the next clean reboot.

Low battery alarm immediately after a confirmed full charge

The DL2 and DL3 BMS stores an OEM cell profile and compares the new cell's internal resistance against it on startup. A fresh Li-Polymer cell reads higher internal resistance than a conditioned one, which can trigger a low-battery threshold before the cell has completed its first full cycle. This is a calibration state, not a fault in the cell. Run one complete charge-to-discharge cycle and allow the device to reboot cleanly — the BMS updates its reference profile and the alarm clears.

Device will not power on after the replacement cell sat in storage

Li-Polymer cells self-discharge during storage, and if the cell drops below approximately 2.5V the BMS enters a deep-discharge lockout state and refuses to boot the device. Placing the battery on a compatible charger at a low-current trickle mode for 15–30 minutes raises the cell above the BMS recovery threshold. Once voltage climbs past 3.0V the BMS re-initialises and normal charging resumes. If the cell does not respond to trickle input, discharge below 2.5V may have caused irreversible capacity loss.