About this replacement
BlueBird EG-340 — 3.7V Li-ion Replacement Battery (BI-1500)
This is a 3.7V 1100mAh Li-ion battery for the BlueBird EG-340 handheld barcode scanner. It fits the EG-340 directly and replaces OEM part numbers BI-1500 and BAT-BI-500. Dimensions are 53.62 × 36.46 × 9.50mm — measure your original pack if you are unsure before ordering.
- EG-340 fit: The EG-340 runs a single-cell 3.7V Li-ion platform with a BMS that monitors cell voltage and temperature during scan trigger events. This pack matches the connector pinout and communicates correctly with the scanner's charge management circuit.
- Bench tested on actual hardware: We cycled this pack through repeated scan-trigger inrush events and wireless polling loads. The BMS held cutoff thresholds within spec and the scanner did not drop connection during burst-scan sequences.
- First-shift preparation: After installing, seat the scanner in its charging cradle for a full charge cycle before use. Scan trigger inrush is highest when the cell is near minimum voltage — starting a pick-and-pack shift on a partially charged new cell can cause the BMS to trip early and interrupt operation.
Cradle showing a charging error on a new pack
EG-340 charging cradles use dock contacts that oxidise over time. When a new pack is seated, higher contact resistance can cause the dock to report a charging fault even though the pack itself is fine. The cradle's charge controller reads the resistance across the contacts as an abnormal condition and halts the charge cycle. Wipe the gold contacts on both the battery and the cradle with a dry cloth, reseat firmly, and the charging indicator should clear within 30 seconds.
Scanner losing wireless connection during rapid scan bursts
During fast barcode scanning, the EG-340 draws simultaneously from the imager and the wireless radio. This combined inrush pulls the cell voltage down sharply for a fraction of a second. If the cell voltage dips below approximately 3.2V during that spike, the BMS may cut output and the radio stack drops its connection to the host. Letting the pack charge fully before a high-frequency scanning session keeps the cell voltage headroom above the BMS threshold and prevents mid-shift disconnects.