Epson EHT-30 Barcode Scanner Compatible Battery 7.4V 2200mAh

Epson EHT-30 / EHT-40 — 7.4V Li-ion Replacement Battery (CA54200-0090)

This 7.4V 2200mAh Li-ion battery replaces the CA54200-0090 pack used in the Epson EHT-30 and EHT-40 handheld barcode scanners. These scanners run in retail, warehouse, and logistics environments where the battery takes repeated charge cycles across extended shifts. Capacity figure is 2200mAh / 16.28Wh — match this against your original pack label before ordering.

• EHT-30 and EHT-40 compatibility: Both models share the same 7.4V battery rail, connector pinout, and BMS handshake protocol, so a single pack covers either unit. Cross-reference OEM part numbers CA54200-0090, FMWBP4, NP-510, NP-520, or NP-530 — all refer to the same physical cell configuration.
• Bench tested on actual hardware: We cycled this pack through the EHT-30 cradle and confirmed the BMS negotiates correctly with the dock charge controller. The protection circuit trips at the expected low-voltage threshold and resets cleanly on reconnection — no manual intervention needed.
• First-shift prep for pick-and-pack use: Place the scanner in its cradle for a full charge cycle before running it on the floor. The scan trigger draws the highest inrush current when the cell is near minimum charge. Starting a shift with a full cell prevents false BMS cutoffs during the first burst of rapid scanning.

Cradle showing charging error on a new pack

The EHT-30 cradle reads battery state through the gold contact pins on the base of the scanner. If those contacts have residue — dust, skin oil, or warehouse grime — the dock interprets high contact resistance as a fault and throws a charging error instead of initiating the charge cycle. Wipe the contacts on both the battery pack and the cradle with a dry lint-free cloth, then reseat the scanner firmly until the dock clicks. If the error clears, the pack was fine — the contacts were the problem. If the error persists after clean contact, check the cradle with a known-good pack to isolate whether the fault is the dock or the battery.

Scanner losing wireless connection during rapid scan bursts

The EHT-30 combines active wireless polling with scan trigger inrush on every barcode read. When both loads spike simultaneously, a degraded or partially charged battery can sag below the voltage floor the radio module needs to hold its link — the connection drops mid-burst even though the scanner screen stays on. This is a voltage sag event, not a radio fault. A fully charged cell at 8.2V holds enough headroom to sustain both loads. If the wireless drops only during fast scanning and recovers within seconds, charge the pack to full before the next shift and monitor whether the problem recurs.