Honeywell BT-700-1 Replacement Battery 3.7V 5200mAh

Honeywell BT-700-1 / Talkman T5 Series — 3.7V Li-ion Replacement Battery (136020805B)

This 3.7V 5200mAh Li-ion battery replaces the factory pack in the Honeywell BT-700-1, A500, Talkman T5, and Talkman T5m handheld scanners. These devices run in warehousing and logistics environments where a degraded cell kills shift productivity fast. Voltage and capacity match OEM spec exactly — 3.7V, 5200mAh (19.24Wh).

• BT-700-1 and Talkman T5 platform fit: These models share the same battery bay geometry, connector pinout, and BMS handshake protocol — one pack covers the full platform. The 3.7V rail feeds both the wireless radio and the scan engine without a step-up converter, so voltage tolerance is tight and cell quality matters.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a BT-700-1 unit. The BMS accepted the pack without error flags, charge termination triggered correctly at 4.2V, and the scan engine and radio drew current simultaneously without triggering a protection cutoff.
• First-shift cradle protocol: After installing this pack, seat the scanner in its charging cradle for a complete charge cycle before starting pick-and-pack work. Scan trigger inrush current peaks when the cell is near minimum — a fully pre-charged pack prevents a false BMS overcurrent trip on the first scan burst of the shift.

Why the Talkman T5 drops wireless connection during rapid scan bursts

The T5 and T5m run a 2.4GHz radio alongside the scan engine from the same 3.7V cell. During a rapid burst of scans, both draws stack — the radio polling cycle and the scan trigger fire nearly simultaneously. If the cell's internal resistance is elevated, the combined inrush pulls the rail below the radio module's minimum operating voltage and the connection drops. A fresh, fully charged cell keeps internal resistance low enough that the rail stays stable under that combined load.

Cradle showing a charging error immediately after fitting the new pack

This usually comes down to contact resistance at the dock, not a fault with the battery or cradle electronics. The BT-700-1 cradle reads the pack through spring-loaded contacts, and any oxidation or debris on either surface raises resistance enough to trigger a fault flag. Wipe the gold contacts on the battery and the cradle pins with a dry cloth, reseat the pack firmly, and re-dock. If the error clears, the contact surface was the issue — the cradle should begin a normal CC/CV charge cycle within 30 seconds of a clean reseat.