Gryphon RBP-GM40 Compatible Battery 3.7V 2600mAh Li-ion

Gryphon GM4100 / RBP-GM40 — 3.7V Li-ion Replacement Battery (128000894)

This 3.7V 2600mAh Li-ion battery replaces the OEM pack in the Gryphon GM4100 and RBP-GM40 handheld barcode scanners. It fits the same battery bay and connects to the same BMS contacts as the original. Capacity is 2600mAh — use the product data, not the worn cell you're replacing.

• GM4100 and RBP-GM40 compatibility: Both models run the same 3.7V single-cell architecture with identical connector pinout and BMS handshake protocol — one pack covers both units without any modification.
• Bench tested on actual hardware: We cycled this pack through scan-trigger inrush and active Bluetooth polling simultaneously. The BMS held stable voltage delivery across the combined load and registered correct charge state on the cradle display.
• First-shift prep for pick-and-pack use: After installing the new pack, seat the scanner in its cradle and complete a full charge cycle before pulling it into rotation. Scan-trigger inrush current peaks when the cell is near minimum — starting the first shift with a full cell prevents false BMS trips during high-frequency scanning.

Cradle showing a charging error on a brand-new pack

The GM4100 cradle communicates with the battery over a dedicated contact pin — if that pin reads elevated resistance, the dock throws a charge fault before current even flows. New packs sometimes arrive with trace oxidation on the gold contacts from packaging. Wipe the battery contacts and cradle bay with a dry lint-free cloth, reseat the scanner firmly, and the charge indicator should clear within 30 seconds. If the error persists, check that the cradle firmware is not filtering an unrecognised cell ID — a brief power cycle of the dock resets the handshake.

Scanner dropping wireless connection during rapid scan bursts

The GM4100 draws from the same cell for both the imager and the Bluetooth radio. During fast consecutive scans, the combined inrush from the scan trigger and the radio transmit pulse creates a momentary voltage dip. If the cell voltage sags below the BMS protection floor — typically around 3.0V under load — the BMS cuts output and the radio drops its connection before the imager. A cell below 50% charge makes this worse. Keep the pack above half capacity during high-frequency scan sessions and return it to the cradle between picking runs.