Philips EverGo 900-12 Compatible Battery 14.4V 7800mAh

Philips EverGo 900-12 / SimplyGo / Sparq — 14.4V Li-ion Replacement Battery (4ICR19/65-3)

This 14.4V, 7800mAh Li-ion battery replaces the OEM pack in the Philips EverGo 900-12, Respironics SimplyGo, and Sparq portable oxygen concentrators. It matches the original voltage rail and BMS communication protocol so the device recognises the pack on first installation. Capacity figure is 112.32Wh as specified in the product data.

• EverGo 900-12, SimplyGo, and Sparq compatibility: All three platforms share the same 14.4V battery bay, connector pinout, and BMS handshake sequence. The concentrator's charge IC reads cell chemistry and voltage from the same register addresses across this model group, so one pack covers all three without modification.
• Bench tested on actual hardware: We cycled this pack through the EverGo's power-on self-test routine and monitored BMS register responses at each stage. The protection circuit tripped correctly at low-voltage cutoff and recovered cleanly on reconnection — no latched fault codes observed.
• Power-on self-test after installation: After fitting this battery, allow the EverGo to complete its full startup self-test without interrupting power. The BMS runs a verification handshake at boot; cutting power mid-sequence writes a false battery fault that persists until the next complete reboot cycle.

Why the EverGo 900-12 alarms low battery seconds after a confirmed full charge

The EverGo's charge IC compares incoming cell data against threshold tables calibrated to the OEM cell's internal resistance profile. A new replacement cell has slightly different resistance characteristics until it completes one full charge-discharge cycle. Until that cycle runs, the BMS flags the pack as below threshold and triggers the low-battery alarm even at full charge. Run one complete charge-discharge cycle before relying on the pack clinically — the alarm clears once the BMS learns the new cell's actual impedance curve.

EverGo won't power on after the battery sat unused in storage

Li-ion cells self-discharge during storage. If voltage drops below approximately 10.8V — the EverGo's BMS recovery floor — the protection circuit latches open and the device shows no response on the power button. Connect the pack to the EverGo's AC charger and leave it for at least 30 minutes before attempting to power on; the charger's pre-charge stage applies a trickle current that brings the cell voltage back above the BMS recovery threshold. If the device still won't respond after 30 minutes on AC, check that wall voltage is present at the adapter output before assuming a cell fault.