Jumper JPD-800A Replacement Battery 11.1V 2600mAh

Jumper JPD-800A / JPD-800B — 11.1V Li-ion Replacement Battery (ICR18650-3S)

This 11.1V 2600mAh (28.86Wh) Li-ion battery replaces the original ICR18650-3S cell pack in the Jumper JPD-800A and JPD-800B portable pulse oximeters. These handheld medical devices monitor blood oxygen saturation and pulse rate non-invasively in clinical and home care settings. Cell degradation over charge cycles is the most common reason these units lose operating duration or fail to hold charge.

• JPD-800A and JPD-800B compatibility: Both models run the same 3S 18650 cell configuration, the same 11.1V nominal rail, and the same BMS connector and handshake protocol — one cell pack fits both without modification.
• Bench tested on actual hardware: We cycled this pack through charge, load, and BMS communication checks. The protection circuit tripped correctly at undervoltage and the charge IC accepted the cell without fault codes.
• Post-swap self-test cycle: After installing this battery, let the JPD-800A complete its full power-on self-test without interruption. The device runs a BMS verification step at startup — cutting power during this sequence flags a false battery fault that persists until the next clean reboot.

Device not completing boot sequence after battery swap

The JPD-800A runs a hardware self-test during every power-on cycle, and the BMS must report a voltage above the device's boot threshold before that sequence completes. A new cell that has partially self-discharged in storage can sit just below this threshold even though the cell is not faulty. If the unit freezes at the boot screen or shuts off before the main display loads, charge the pack fully before retrying — the charge IC on this pack targets 12.6V at full charge across all three cells.

Low battery alarm triggers immediately after a confirmed full charge

This happens when the device's BMS compares the new cell's charge profile against the threshold calibrated for the original factory cell chemistry. On a fresh replacement, the BMS hasn't completed a learn cycle and can misread state-of-charge on the first use. Run one complete charge-discharge cycle — charge to 12.6V, allow the device to discharge through normal use until it powers off, then charge fully again. After that first cycle, the alarm threshold recalibrates and the fault clears.