Dolphin 7900 Barcode Scanner Replacement Battery 7.4V 3400mAh

Dolphin 7900 / 9500 / 9550 / 9900 — 7.4V Li-ion Replacement Battery (200-00591-01)

This 7.4V, 3400mAh (25.16Wh) lithium-ion pack replaces part number 200-00591-01 in the Dolphin 7900, 9500, 9550, and 9900 handheld barcode scanners. These are mobile data capture devices used in retail, warehousing, and inventory workflows. The pack slots into the original battery bay and communicates with the host BMS without modification.

• 7900 / 9500 / 9550 / 9900 platform compatibility: All four models share the same 7.4V nominal voltage rail, battery bay form factor, and BMS communication protocol, which is why a single part number covers the range. The connector pinout and pack dimensions are identical across the series.
• Bench tested on actual hardware: We cycled this pack on a 7900 unit under combined scan-trigger and wireless radio load. The BMS held voltage within the accepted operating window across repeated scan bursts and correctly flagged low-cell conditions before shutoff.
• First-shift prep for pick-and-pack operations: Place the scanner in its cradle for a full charge cycle before putting the pack into rotation. Scan-trigger inrush current is highest when the cell is near minimum state of charge — a pre-charged pack prevents false BMS trips during the first shift's peak-demand period.

Cradle showing a charging error on a new pack

A charging error on the dock immediately after fitting a new pack is almost always a contact resistance issue, not a fault in the battery itself. The Dolphin charging cradle uses spring-loaded pogo pins that can accumulate oxidation or debris, especially in high-traffic warehouse docks. Even a small resistance increase at those contacts causes the charger to misread the pack's initial voltage and throw an error flag. Wipe the gold contacts on both the pack and the cradle with a dry lint-free cloth, reseat the scanner firmly, and the charge indicator should clear within 30 seconds.

Scanner losing wireless connection during rapid scan bursts

During back-to-back scan sequences, the device pulls current simultaneously from the laser or imager, the processor, and the wireless radio. On a degraded or deeply discharged pack, this combined draw causes a momentary voltage sag that drops the radio below its minimum operating threshold and kills the connection. The scanner may appear to still be scanning locally while wireless sync has already dropped. If this happens mid-shift, dock the unit for 10–15 minutes to bring the cell above 3.7V per cell before resuming high-frequency scanning.