Sokkia SDR8100 Compatible Battery 3.7V 1800mAh

Sokkia SDR8100 — 3.7V Li-ion Replacement Battery (20-36098-01)

This is a 3.7V, 1800mAh Li-ion battery for the Sokkia SDR8100 handheld data collector. The SDR8100 is a rugged field device used in surveying, construction, and inventory workflows. This pack replaces OEM part number 20-36098-01 directly.

• SDR8100 platform fit: The SDR8100 runs a single-cell 3.7V Li-ion rail with a BMS that monitors cell voltage and temperature. This pack matches that voltage rail and uses the same connector pinout and BMS communication protocol as the OEM unit, so the device recognises the pack on insertion without any configuration change.
• Bench tested on actual hardware: We cycled this pack under combined scan-trigger and wireless polling loads to confirm BMS behaviour at low state-of-charge. The protection circuit held cutoff at the correct threshold and recovered cleanly on reconnection to the charging cradle.
• First-shift charging tip: After installing, place the scanner in its cradle for a full charge cycle before using it in the field. Scan trigger inrush current is highest when the cell is near minimum — a fully charged pack prevents false BMS trips on the first shift.

Cradle showing a charging error on a new pack

A new Li-ion cell shipped in a partial state of charge — typically 40–60%. Some SDR8100 docking cradles flag this as a fault because the pack voltage sits below the cradle's expected threshold for a "ready" pack. The cradle's charge controller reads the incoming cell voltage, and if contact resistance on the dock terminals is also elevated, it can push the reading below the acceptance window. Wipe the gold contacts on both the battery and the cradle with a dry cloth, reseat the pack firmly, and let the cradle begin a fresh charge cycle. If the error clears within 30 seconds, contact resistance was the cause — not the cell.

Scanner losing wireless connection during rapid scan bursts

The SDR8100 draws from the same cell for both the scan engine and the wireless radio. During rapid scan bursts, the combined inrush from the laser or imager firing and the radio transmitting simultaneously creates a brief voltage sag on the cell. If the cell is aged or below 3.5V, that sag can trip the BMS undervoltage cutoff, which drops the radio connection mid-burst. This pack's BMS is rated to handle the combined draw without tripping under normal burst frequency. If drop-outs persist, check cell voltage under load — anything below 3.5V at rest means the pack needs a full charge before field use.