Terumo TE-SS700 Infusion Pump Replacement Battery 7.4V 2600mAh

Terumo TE-SS700 / TE-SS800 Series — 7.4V Li-ion Replacement Battery (110841)

This 7.4V 2600mAh lithium-ion battery replaces OEM part 110841 in the Terumo TE-SS700, TE-LF600, TE-SS800, and TE-SS800 infusion pumps. These are portable medical infusion devices used for controlled fluid delivery in clinical wards and home care settings. Voltage and capacity match OEM spec exactly — 7.4V, 2600mAh (19.24Wh).

• TE-SS700 / TE-LF600 / TE-SS800 platform fit: These models share a common 7.4V Li-ion battery format, the same connector pinout, and a compatible BMS handshake protocol. A single cell specification covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through the TE-SS800 charge management circuit and monitored BMS communication. The charge IC accepted the cell without fault flags, and the BMS completed its verification handshake on the first full cycle.
• Post-swap self-test protocol: After installing this battery, allow the infusion pump to complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.

Low battery alarm firing immediately after a confirmed full charge

Terumo infusion pumps apply a charge-verification threshold calibrated to the internal resistance profile of a conditioned OEM cell. A new replacement cell presents a slightly different impedance signature on the first cycle, which the BMS can misread as insufficient charge state. The device then triggers its low battery alarm even though the cell is at full voltage. Run one complete charge-discharge cycle before clinical use — after that single conditioning cycle, the BMS recalibrates its threshold to the new cell and the alarm clears.

Pump will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage, and if the resting voltage drops below approximately 2.5V per cell (5.0V at pack level), the BMS locks the output circuit as a deep-discharge protection measure. The pump receives no power and shows no response at power-on. Place the battery on charge for a minimum of two to four hours before attempting to boot the device — most BMS controllers require the pack to reach at least 6.0V before they release the protection latch and allow the pump to initialise.