About this replacement
Metrologic MS9535 VoyagerBT — 3.7V Li-ion Replacement Battery (46-46870)
This 3.7V, 1400mAh Li-ion cell replaces the original pack in the Metrologic MS9535, MS9535 VoyagerBT, MS9535BT, and Dolphin 9535 handheld barcode scanners. It matches OEM part numbers 46-46870, 00-06260A, and 95359535BT. Swap it when the original cell no longer holds enough charge to get through a shift.
- MS9535 and VoyagerBT platform fit: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — which is why one pack covers the full MS9535 family and the Dolphin 9535 variant.
- Bench tested on actual hardware: We cycled this pack through repeated scan-trigger inrush events and Bluetooth polling loads. The BMS held cutoff thresholds correctly and did not false-trip under combined radio and laser draw.
- First-shift preparation on the MS9535: After installing, seat the scanner in its charging cradle and run a full charge cycle before picking up the first shift. Scan-trigger inrush current spikes hardest when the cell is near minimum, and a pre-charged pack prevents a false BMS cutoff on the first pull of the trigger.
Cradle showing a charging error on a new pack
The MS9535 cradle reads pack state through gold contact pads on the battery base. If those pads have oxidation, residue, or debris from the old pack, the dock reports a charging fault even though the new cell is fine. Wipe the contacts on both the battery and the cradle with a dry lint-free cloth, then reseat the scanner firmly until it clicks. If the error clears, charging was never the issue — it was contact resistance. The cradle should show a solid charge indicator within 30 seconds of a clean reseat.
Scanner not reading barcodes after battery swap
The MS9535 laser or imager needs the cell above a minimum voltage threshold before the scan engine will fire at full power. A freshly installed but uncharged replacement pack may sit at 3.4V or below, which the scanner accepts for standby but not for active scanning. The device powers on and appears normal, then fails to decode — or decodes intermittently on high-contrast labels only. Charge the pack to 4.2V in the cradle before first use and the scan engine will operate at rated output.