Dolphin 99EX Replacement Battery 3.7V 2400mAh Li-ion

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

This 3.7V, 2400mAh Li-ion battery fits the Dolphin 99EX, 99EX-BTEC, 99EXhc, and 99GX rugged mobile computers. These handheld scanners run warehouse, retail, and logistics operations where a dead battery mid-shift costs real time. The OEM part numbers covered are 99EX-BTEC-1 and 99EX-BTES-1.

• 99EX and 99GX platform compatibility: Both the 99EX and 99GX share the same battery bay dimensions, connector pin layout, and BMS handshake protocol — a single cell covers the full platform without modification or adapter.
• Bench tested on actual hardware: We cycled this pack on the 99EX under combined wireless and scan-trigger load. The BMS held cutoff thresholds correctly at both high-draw bursts and sustained low-draw polling, with no false trips across the test runs.
• First-shift preparation on cradle-charged devices: After installing a new pack, seat the scanner in its charging cradle and run a full charge cycle before deploying it. Scan-trigger inrush current is highest when the cell sits near minimum charge — starting the shift with a topped-up cell prevents false BMS trips on that first pick-and-pack run.

Cradle showing a charging error on a new pack

The Dolphin charging cradle reads pack state through spring-loaded dock contacts on the base of the scanner. Oxidation or debris on either the pack contacts or the cradle pins raises contact resistance enough to trigger a charge fault — the dock interprets this as a bad pack rather than a connection issue. Remove the battery, wipe the gold contacts on the pack and the cradle pins with a dry lint-free cloth, then reseat firmly. If the error clears, the cell is fine and the fault was contact resistance, not the battery.

Scanner losing wireless connection during rapid scan bursts

The 99EX runs both the imager and the 802.11 radio simultaneously during active scanning. A rapid scan burst pulls inrush current from the imager at the same moment the radio is polling the access point — combined draw can sag cell voltage enough to momentarily drop the wireless stack. This typically surfaces on older or partially degraded packs, but can also appear on a new pack that shipped at storage charge. A full cradle charge before the shift brings cell voltage to the level needed to absorb both loads without sag-induced disconnects.