Honeywell 99EX-BTEC-1 Barcode Scanner Replacement Battery 3.7V 5200mAh

Honeywell Dolphin 99EX / 99GX — 3.7V Li-ion Replacement Battery (99EX-BTEC-1)

This is a 3.7V, 5200mAh Li-ion replacement battery for the Honeywell Dolphin 99EX, 99EXhc, and 99GX mobile computers. It replaces OEM part numbers 99EX-BTEC-1 and 99EX-BTES-1. These scanners run in warehouse and logistics environments where battery drain is constant and shift continuity matters.

• 99EX, 99EXhc, and 99GX compatibility: All three models share the same battery bay dimensions, 3.7V rail, and BMS handshake protocol. The connector and cell format are identical across the series, so one pack covers the full line.
• Bench tested on actual hardware: We ran this pack in a Dolphin 99EX under active scan and wireless polling load. The BMS held stable through repeated scan-trigger inrush cycles and did not trip under combined Wi-Fi and imager draw.
• First-shift cradle protocol: After installing this pack, seat the scanner in its charging cradle and run a full charge cycle before deploying it. Scan-trigger inrush current spikes highest when the cell is near minimum voltage — a fully charged cell prevents false BMS trips on the first pick-and-pack shift.

Cradle showing a charging error after fitting a new pack

Charging errors on the dock after a battery swap are almost always a contact resistance issue, not a faulty cell. The 99EX cradle reads pack state through the battery contacts, and any oxidation or debris on the gold pads breaks that circuit. Wipe the battery contacts and the cradle pins with a dry cloth, then reseat the scanner firmly until it clicks. If the error clears within 30 seconds, the contacts were the cause — not the pack.

Scanner dropping wireless connection during rapid scan bursts

The 99EX pulls current from two sources at once during a fast scan burst — the imager and the Wi-Fi radio both draw simultaneously. If the cell voltage sags below roughly 3.4V under that combined load, the radio resets to protect the imager circuit. This appears as a dropped connection or a network timeout mid-scan, not a scanner freeze. Charge the pack fully before a high-volume shift and monitor whether dropouts cluster at the end of the shift, which confirms voltage sag rather than a network fault.