Casio DT-823LI Barcode Scanner Replacement Battery 3.7V 1450mAh

Casio DT-800 / DT-810 Series — 3.7V Li-ion Replacement Battery (DT-823LI)

This 3.7V, 1450mAh Li-ion battery replaces the OEM DT-823LI pack in the Casio DT-800 and DT-810 handheld barcode scanners. These are mobile data terminals used in retail, warehouse, and asset-tracking environments. It matches the original voltage rail and connector configuration for a direct swap.

• DT-800 and DT-810 compatibility: Both models run on the same 3.7V single-cell architecture with an identical battery bay and BMS handshake protocol. One replacement SKU covers both units without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the DT-800 platform. The BMS accepted the cell without fault codes, and the charging circuit held a stable 4.2V cutoff at full charge.
• First-shift preparation: After installing the new pack, seat the scanner in its cradle for a full charge cycle before the shift starts. Scan-trigger inrush current is highest when the cell is near minimum voltage, and a fully charged pack prevents false BMS cutoffs during the first high-frequency scan burst.

Cradle showing a charging error on a new DT-823LI pack

Casio cradle docks use spring-loaded contacts that can build up oxidation or debris, and a new pack with tight tolerances will sometimes sit slightly proud of the bay. The dock interprets high contact resistance as a fault and throws a charging error rather than attempting to charge. Wipe the gold contacts on both the battery and the cradle with a dry cloth, then press the scanner firmly into the dock until you hear the seating click. If the error clears and charging begins, the contact surface was the issue — not the pack or the dock electronics.

Scanner losing wireless connection during rapid scan bursts

The DT-800 pulls simultaneously from the wireless radio and the scan trigger during a rapid burst cycle — both loads spike at the same moment. When the cell voltage sags below roughly 3.4V under that combined draw, the radio module drops its connection before the scanner shuts down entirely. This is most common mid-shift when the pack is partially depleted and scan frequency is high. Swap to a freshly charged pack and monitor whether the dropouts stop — if they do, the cell was not holding voltage under load, not the radio hardware.