Thermo Scientific S1 Pipet Filler Replacement Battery 3.7V 2200mAh

Thermo Scientific S1 Pipet Filler — 3.7V Li-ion Replacement Battery (Y/W0823)

This 3.7V, 2200mAh Li-ion cell is the replacement battery for the Thermo Scientific S1 Pipet Filler. The S1 is a motorized electronic pipette filler used in clinical and research labs for controlled liquid aspiration and dispensing. Voltage and capacity match OEM specs — also cross-references TS 22688 and 22688-VAN.

• S1 Pipet Filler compatibility: The S1 platform uses a 3.7V single-cell Li-ion architecture with a built-in BMS that monitors cell voltage, temperature, and charge state. This replacement cell matches the OEM connector pinout and BMS communication protocol — the filler's charge IC will recognize it without throwing a battery fault on startup.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the S1 platform. The BMS completed its initialization handshake, the charge indicator progressed normally, and the motor drive circuit drew current within the expected load profile across multiple aspiration cycles.
• Post-swap self-test cycle: After installing this battery, allow the S1 to complete its full power-on self-test without interrupting the sequence. The device runs a BMS verification routine at startup — cutting power mid-sequence can register a persistent battery fault that will not clear until the next complete reboot.

Why the S1 Pipet Filler flags a battery fault on a brand-new cell

The S1's charge IC applies a conservative acceptance threshold calibrated to an aged OEM cell's internal resistance profile. A fresh Li-ion cell with lower internal resistance can read as out-of-spec on the first initialization, triggering a fault flag. This is not a defective battery — it is the BMS running a learn cycle. One full charge-discharge cycle from 0% to 100% is usually enough for the controller to update its reference values and clear the fault.

Charge indicator stuck below 100% on first charge

On the first charge, the S1's charge IC may hold the indicator at 90–95% and not advance to full. This happens because the charge algorithm applies a reduced top-off current to new cells until it confirms stable cell voltage at the 4.2V cutoff. Let the device remain on the charger past the point where the indicator stalls — the IC will complete the constant-voltage phase and reach 100% once the cell voltage holds steady. Do not remove and reinsert the battery during this phase, as it resets the charge IC's cycle counter.