Vocollect Talkman A500 Compatible Battery 3.7V 4400mAh 730022

Vocollect Talkman A500 / T5 Series — 3.7V Li-ion Replacement Battery (730022)

This 3.7V, 4400mAh Li-ion cell replaces the original battery in the Vocollect Talkman A500 and T5 wearable voice-directed picking devices. It matches the OEM part numbers 730022, 136020805B, 730040, and BT700. The pack slots into the same battery bay and connects to the same BMS interface as the factory unit.

• A500 and T5 platform compatibility: Both models run the same 3.7V power rail and use the same BMS handshake protocol, so one pack covers the full Talkman wearable line without firmware differences or connector adapters.
• Bench tested on actual hardware: We cycled this pack through the Talkman charging dock and monitored BMS communication throughout. The protection circuit responded correctly to charge cutoff, over-discharge cutoff, and scan-trigger inrush spikes without tripping into fault mode.
• First-shift prep for picking operations: After installing, seat the device in its charging cradle and run a full charge cycle before heading to the floor. The scan trigger draws its highest inrush current when the cell is near minimum charge, and a fully charged pack prevents false BMS trips on the opening scan bursts of the first shift.

Why the Talkman A500 drops its wireless link during rapid scan bursts

The A500 runs its wireless radio and scan trigger simultaneously, and the combined inrush during a fast scan burst can pull the cell voltage below the BMS low-voltage threshold momentarily. When cell capacity has faded, the internal resistance rises, which amplifies the voltage sag under that combined load. The BMS interprets the sag as a fault condition and suspends the radio to protect the cell. A fresh 4400mAh pack with lower internal resistance handles the combined draw without triggering that cutoff.

Charging dock shows an error light immediately after inserting the new pack

This almost always traces to contact resistance between the pack terminals and the dock's charge contacts, not a fault in the battery itself. Warehouse docks accumulate dust, label adhesive, and oxidation on the contact pins, and a new pack with slightly different terminal geometry can expose that resistance. Wipe the pack's gold contacts with a dry cloth, then clean the dock pins with a cotton swab. Reseat the pack firmly — the dock error should clear within 30 seconds once contact resistance drops below the dock's threshold.