About this replacement
Stripe WisePad 3 — 3.7V Li-Polymer Replacement Battery (HVC453450)
This is a 3.7V, 800mAh Li-Polymer replacement battery for the Stripe WisePad 3 and WPC32 payment terminals. It slots in when the original cell loses capacity and the terminal can no longer hold charge through a normal transaction shift. Part number HVC453450 matches the OEM connector and BMS interface on both models.
- WisePad 3 and WPC32 compatibility: Both terminals run on the same 3.7V power rail and use the same HVC453450 cell format with identical connector pinout and BMS communication protocol — one battery covers both units.
- Bench tested on actual hardware: We ran the terminal through full boot-to-idle and active transaction sequences. The BMS accepted the new cell without error flags, and the charge IC entered normal CC/CV cycle without triggering protection cutoff.
- First deployment tip for WisePad 3: After installation, complete one full transaction cycle before using the terminal in a live environment. The terminal maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator correctly.
WisePad 3 rebooting mid-transaction after battery swap
A freshly installed cell can cause mid-transaction reboots if the BMS hasn't completed its initial handshake with the terminal's charge IC. When the receipt printer motor fires or the NFC reader pulses, current draw spikes briefly above the BMS overcurrent threshold on an uncalibrated cell. The BMS reads this as a fault and cuts output, dropping the terminal. Run the unit through two or three full boot-charge cycles before live deployment to let the BMS settle its overcurrent trip point.
Terminal won't power on after sitting unused in a drawer
Li-Polymer cells self-discharge at roughly 2–5% per month, and the WisePad 3's standby draw accelerates this if the unit isn't fully powered down. After extended storage, the cell voltage can drop below the BMS recovery threshold — typically around 2.5V — and the terminal refuses to boot. Connect the terminal to the OEM charger and leave it for at least 60 minutes without pressing the power button; the charge IC needs time to trickle-charge the cell back above the 2.8V reinitialisation threshold before the BMS will allow a boot sequence.