About this replacement
BrandTech Transferpette Electronic — 3.6V Ni-MH Replacement Battery (705500)
This 3.6V, 700mAh Ni-MH cell replaces the internal battery in the BrandTech Transferpette and Multichannel Transferpette electronic pipette range. It powers the motor drive and control electronics that handle precise liquid dispensing. When the original cell loses capacity, aspiration and dispense cycles become inconsistent — this battery restores normal operation.
- Transferpette single and multichannel compatibility: Both single-channel and multichannel Transferpette variants share the same 3.6V Ni-MH cell format and connector. The BMS in each model reads cell voltage at startup and applies the same charge termination logic, so one cell fits across the platform without firmware differences affecting compatibility.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on Transferpette hardware. The BMS accepted the cell without fault codes, charge termination triggered correctly at full capacity, and motor load during aspiration drew current within the cell's rated output range.
- Power-on self-test after installation: After fitting this battery, let the Transferpette complete its full startup self-test without pressing any buttons or interrupting power. The BMS runs a voltage verification routine at boot — cutting it short logs a false battery fault that persists until the next clean reboot cycle.
BMS learn cycle on a fresh Ni-MH cell in the Transferpette
Ni-MH cells leave storage with a partial charge and a slightly suppressed voltage curve. The Transferpette's charge IC uses delta-V detection to confirm a full charge, but a new cell's voltage response is flatter in the first two cycles, which can cause the IC to undercharge before terminating. Running one complete charge-discharge-charge cycle normalises the cell's voltage signature. After that, the BMS reads the cell accurately and charge termination lands at the correct endpoint.
Transferpette not powering on after the battery sat unused
Ni-MH cells self-discharge at roughly 1–2% per day. A cell stored for several months inside a pipette can drop below the BMS recovery threshold — typically around 2.8V for a 3.6V Ni-MH pack — causing the device to appear completely dead. Placing the battery on a stand-alone Ni-MH charger for 15–20 minutes at a low trickle rate (0.1C) can bring the cell above that threshold before re-inserting it. Once the cell reads above 3.0V, the device BMS will accept it and allow normal charging to resume.