About this replacement
Biocare IM15 — 14.8V Li-ion Replacement Battery (4S2P18650-H1008)
This 14.8V, 5200mAh lithium-ion battery replaces the OEM pack in the Biocare IM15 portable patient monitor. It matches the original voltage rail and connector spec, and crosses to OEM part numbers 4S2P18650-H1008 and NP-1. Capacity figure is taken directly from the product specification — 76.96Wh total energy.
- IM15 platform fit: The IM15 runs a 4S2P 18650 cell configuration at 14.8V nominal. This pack matches that cell arrangement, voltage rail, and the BMS handshake the device expects at power-on. Any deviation in cell count or voltage would trigger a battery fault on boot.
- Bench tested on actual hardware: We cycled this pack through the IM15 power-on self-test sequence and monitored BMS communication. The pack passed the self-test threshold on the second full charge cycle after an initial shallow first charge — consistent with new 18650 cell behaviour on medical-grade BMS logic.
- First-use self-test protocol: After installing this pack, allow the IM15 to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power during this sequence logs a false battery fault that persists until the next complete reboot.
Why the IM15 flags a battery fault immediately after a confirmed full charge
The IM15 BMS compares the incoming pack's charge state against a learned threshold calibrated to the OEM cell chemistry. A new replacement cell has not completed a learn cycle, so the BMS may reject the charge reading even when the charger shows 100%. This is not a fault with the pack — it is the BMS applying a conservative first-use threshold. Run one full charge-to-discharge cycle before clinical deployment. After that cycle, the BMS recalibrates its threshold and the fault clears.
IM15 will not power on after the battery sat unused in storage
Lithium-ion cells self-discharge over time. If this pack sat in storage for several months, cell voltage may have dropped below the IM15 BMS's minimum recovery threshold — typically around 2.5V per cell, or 10V at pack level. Below that threshold the BMS locks out the discharge circuit as a protective measure and the device will not respond at all. Connect the pack to the OEM charger and leave it for a minimum of two hours without interruption — most chargers apply a trickle pre-charge below 3.0V per cell to bring the pack back into the normal charge window before switching to full current.