About this replacement
ADE PWI30 — 3.7V Li-ion Replacement Battery (ISR18650)
This 3.7V, 5200mAh Li-ion battery replaces the ISR18650 cell in the ADE PWI30 medical device. It restores power to units where the original cell has aged, depleted, or failed to hold charge. Voltage and capacity match the OEM specification exactly.
- PWI30 platform fit: The PWI30 operates on a single 18650-format Li-ion cell at 3.7V nominal. The connector pinout and cell dimensions — 66.20 × 37.10 × 20.80mm — match the original bay without modification. The onboard BMS reads cell voltage directly, so cell chemistry and voltage must match or the device will not pass its power-on check.
- Bench tested on actual hardware: We cycled this cell through charge and discharge under the PWI30's typical load profile. The BMS accepted the cell on the first insertion, completed charge without fault flags, and held voltage within spec across the first three cycles.
- Post-swap self-test protocol: After fitting this cell, allow the PWI30 to complete its full power-on self-test without interruption. Medical devices run a BMS verification routine at startup — cutting power during this sequence can create a persistent false battery fault that survives until the next clean reboot.
Why the PWI30 charge indicator stalls below 100% on the first charge
The PWI30's charge IC applies a conservative current limit when it detects a cell it has not previously profiled. On a new ISR18650, this means the first charge cycle runs longer and may plateau at 95–98% before the IC releases the final top-up current. This is normal behaviour, not a fault. The indicator will reach 100% once the IC confirms cell impedance is within its acceptance window, typically after the first full charge completes. Do not interrupt the charge or remove the cell during this cycle.
PWI30 alarming low battery immediately after a confirmed full charge
The PWI30's BMS checks cell voltage against a threshold calibrated to the OEM cell's internal resistance profile. A new ISR18650 cell has slightly higher impedance than a broken-in cell, which causes a brief voltage sag under the device's initial load draw — enough to trigger the low-battery alarm even when the cell is fully charged. This condition resolves after one complete charge-discharge cycle, which allows the BMS to update its load-response baseline. Run one full cycle before clinical use, then recheck the alarm status.