Psion 7545 Replacement Battery 3.7V 5200mAh 1110108

Psion 7545 / XT15 Series — 3.7V Li-ion Replacement Battery (1110108)

This is a 3.7V 5200mAh Li-ion battery for the Psion 7545, XT10, XT15, and ST3003 series rugged handheld terminals. It matches the original cell footprint and connector used across these mobile data collection devices. Capacity is drawn from the product specification — 19.24Wh total energy.

• 7545, XT10, XT15, and ST3003 platform: These models share the same 3.7V battery bay, connector pinout, and BMS handshake protocol. One cell fits all variants in this family without modification or adapter.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a 7545 unit. The BMS accepted the cell without fault codes, and the scan trigger inrush current did not trip the low-voltage cutoff under repeated rapid-fire scanning.
• First-shift preparation on the 7545: After installing, seat the scanner in its cradle for a full charge cycle before starting pick-and-pack. Scan trigger inrush is highest when the cell sits near minimum state-of-charge — a pre-charged pack prevents false BMS trips on the first scan burst of a shift.

Cradle showing a charging error on a new pack

The 7545 cradle reads the battery's contact pins to initiate a charge handshake. If dock contacts carry oxidation or debris, the cradle flags a fault rather than charging. Remove the pack, wipe the gold contacts on both the battery and the cradle slot with a dry cloth, then reseat firmly. If the error clears, the contacts were the cause — not the cell.

Scanner dropping wireless connection during rapid scan bursts

On the 7545, the scan trigger and wireless radio draw current at the same time during a rapid burst. If the cell voltage sags below the radio's operating floor mid-burst, the wireless module resets and drops the connection. This is more common on a partially charged pack or one that has been sitting discharged. Charge the pack fully before use — the radio link stabilises above 3.6V under combined load.