Dolphin 6500EP Replacement Battery 3.7V 140mAh PR-042025

Dolphin 6500EP — 3.7V Li-Polymer Replacement Battery (PR-042025)

This 3.7V 140mAh Li-Polymer battery replaces the PR-042025 pack in the Dolphin 6500EP handheld barcode scanner. The 6500EP is used in retail, warehouse, and logistics environments for inventory scanning and point-of-sale transactions. At 26.90 × 20.20 × 4.50mm, this cell matches the original form factor exactly.

• 6500EP platform fit: The 6500EP uses a compact Li-Polymer cell because the housing leaves no room for a cylindrical pack. Voltage rail, connector pinout, and BMS handshake all match the OEM PR-042025 specification — the scanner's firmware accepts the pack without a recalibration prompt.
• Bench tested on actual hardware: We cycled this pack through scan-trigger inrush and wireless polling loads simultaneously. The BMS held the rail steady and did not trip under combined draw. Cell voltage at rest settled at 3.72V after a full charge cycle.
• First-install charge cycle: After fitting the new pack, place the 6500EP in its cradle and run a complete charge cycle before the first shift. Scan-trigger inrush current is highest when the cell is near minimum — a fully charged cell prevents false BMS trips when the first pick-and-pack shift starts.

Cradle showing a charging error on a new PR-042025 pack

A charging error on a fresh pack almost always comes down to dock contact resistance, not a fault with the battery itself. The 6500EP cradle uses spring-loaded gold contacts that accumulate oxidation and debris over time. When resistance on those contacts rises, the cradle's charge controller sees an abnormal voltage drop and flags an error. Wipe the pack contacts and the cradle contacts with a dry lint-free cloth, reseat the scanner firmly, and the error clears in most cases.

Scanner losing wireless connection during rapid scan bursts

During a fast scan sequence, the 6500EP draws current from two sources at once — the imager firing and the wireless radio polling the host system. On a degraded or under-charged cell, that combined inrush pulls the voltage rail below the radio module's minimum operating threshold. The radio drops, the scanner pauses, and the operator loses the connection mid-batch. Charge the pack fully before the shift and confirm resting voltage is at or above 3.7V before use.