About this replacement
Optelec Compact+ — 2.4V Ni-MH Replacement Battery (EP-1)
This is a 2.4V, 2000mAh Ni-MH replacement battery for the Optelec Compact+ electronic magnifier. It fits both the Compact+ and Compact Plus variants. The cell matches the original EP-1 specification and is a direct swap for users whose existing battery no longer holds a useful charge.
- Compact+ and Compact Plus compatibility: Both device names refer to the same hardware platform. The battery connector, BMS voltage rail, and cell footprint are identical across both — the naming difference is regional, not technical.
- Bench tested on actual hardware: We cycled this cell through the Compact+'s onboard charging circuit and confirmed BMS handshake, correct termination voltage, and stable output under backlight load at full brightness.
- First-cycle brightness setting: Run the device at 50% screen brightness during the first full charge cycle. Maximum brightness on the first cycle after a cell swap draws extra current that can confuse the battery indicator — the percentage reading stabilises after one full charge-discharge cycle at moderate brightness.
Image colour shifting before the battery indicator shows low
The Compact+'s display driver is voltage-sensitive. As the cell approaches the lower end of its discharge curve, the backlight driver receives less voltage before the battery gauge registers a low reading. This causes colour temperature and contrast to shift visibly — whites appear warmer, text contrast drops — while the battery indicator still shows remaining charge. It is not a display fault. The cell is nearing cutoff voltage even though the gauge has not caught up.
Screen flickering immediately after fitting a new cell
Flickering on a fresh cell usually means the battery contact points on the device are not making full connection. Remove the battery, clean the gold contacts on both the battery and the bay with a dry cotton swab, and reseat the cell firmly. If the flicker persists only at maximum brightness, the cell voltage is temporarily sagging under peak backlight draw — drop brightness one step and cycle the device off and on. A stable cell at 2.4V nominal should hold the backlight steady at all brightness levels once contacts are clean.