Keyence HR-100 Barcode Scanner Replacement Battery 3.7V 2000mAh

Keyence HR-100 — 3.7V Li-ion Replacement Battery (50121527-005)

This 3.7V, 2000mAh Li-ion cell is a direct replacement for the Keyence HR-100 handheld barcode scanner. It fits the HR-100 using OEM part references 50121527-005 and HR-B1. The HR-100 is a portable data collection scanner used in warehousing, retail, and logistics environments where multi-shift use is common.

• HR-100 platform fit: The HR-100 uses a 3.7V single-cell Li-ion pack with a BMS that monitors cell voltage and temperature. This replacement matches the OEM connector pinout and BMS communication protocol so the scanner's battery indicator reports correctly.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and wireless radio draw sequences. The BMS held cutoff thresholds within spec and the cell voltage recovered cleanly to 4.2V at full charge with no false protection trips.
• First-install charging on the HR-100: After installing, seat the scanner in its cradle and complete a full charge cycle before starting a pick-and-pack shift. Scan trigger inrush current is highest when the cell sits near minimum voltage — starting fully charged prevents the BMS from tripping on the first heavy scan burst.

Cradle showing a charging error on a freshly installed pack

The HR-100 cradle reads battery state through the dock contacts on the pack's base. If those contacts have oxidation or residue from handling, contact resistance rises above what the cradle's charge controller expects, and it throws a fault instead of starting a charge cycle. Wipe the gold contacts on both the pack and the cradle with a dry lint-free cloth, then reseat firmly. If the error clears and charging starts, the contacts were the cause — not a fault with the cell itself.

Scanner dropping wireless connection during rapid scan bursts

The HR-100 draws simultaneously from both the wireless radio and the scan engine during a fast burst sequence. If cell voltage sags below the radio module's minimum operating threshold during that combined inrush, the radio drops its connection before the BMS trips the battery entirely. This looks like a network or pairing fault but is actually a voltage sag event. Ensure the pack is charged to at least 3.9V before a high-frequency scanning session — a depleted cell cannot sustain the combined draw without sagging.