Chameleon RF FL1400 Replacement Battery 7.4V 1800mAh

Chameleon RF FL1400 — 7.4V Li-ion Replacement Battery (21-36575-06)

This 7.4V 1800mAh Li-ion battery replaces the pack in the Symbol/Motorola RF FL1400 handheld barcode scanner. It covers OEM part numbers 21-36575-06, 21-38602-06, 21-40951-06, and 29-40951-06. The cell chemistry and BMS thresholds match what the FL1400's charging circuit expects.

• FL1400 platform fit: The FL1400 runs a 7.4V two-cell Li-ion architecture. All four OEM part numbers above share the same connector pinout and BMS communication protocol, so this pack slots into any FL1400 unit without a firmware mismatch.
• Bench tested on actual hardware: We cycled this pack through charge, scan-burst discharge, and cradle re-seat sequences. The BMS held cutoff voltage correctly and the dock recognised the pack without throwing a charging fault on any test unit.
• First-shift preparation: After installing, seat the scanner in its cradle and run a full charge cycle before pulling it into a pick-and-pack shift. The scan trigger draws the highest inrush current when the cell is near minimum — starting the shift on a full cell prevents a false BMS trip during the first hour of scanning.

Cradle showing a charging error after fitting a new pack

The FL1400 cradle reads the battery through a set of spring-loaded dock contacts on the underside of the unit. A new pack sometimes ships with a light oxide layer on those contacts from storage. If the dock sees contact resistance above its threshold, it throws a charging error rather than attempting to charge. Wipe the gold contact pads on the battery and the dock with a dry cloth, reseat firmly, and the error clears in most cases. If the fault persists, check that the cradle's contact pins are not recessed — bent pins cause the same symptom.

Scanner drops wireless connection during rapid scan bursts

The FL1400 pulls current for both the scan trigger and the wireless radio simultaneously during a fast scan sequence. When the cell voltage sags under that combined load, the radio subsystem is first to drop — the scanner stays on but the connection cuts out mid-burst. This is a voltage-sag issue, not a radio fault. Ensure the pack is above 7.0V before starting a high-frequency scanning session. If sag persists on a fully charged pack, the cradle contacts may be adding resistance and reducing available current — clean and reseat as above.