About this replacement
Diebold AccuVote-TSX — 12V Ni-MH Replacement Battery (10HR-4/3FAU)
This 12V 3600mAh (43.2Wh) nickel-metal hydride battery replaces the backup power pack in Diebold AccuVote-TSX touch screen voting machines. It fits models listed under OEM part numbers 10HR-4/3FAU, 29-014509-000A-1, HHR-380AB27F10, and H450AE-10DB. The battery supports the machine's backup system during power fluctuations or outages at polling locations.
- AccuVote-TSX platform fit: These machines share a common 12V backup rail and a standardised connector housing. The BMS handshake expects a Ni-MH pack at this voltage — substituting a different chemistry causes the machine's charge controller to reject the pack or misread state of charge.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the AccuVote-TSX platform and confirmed the BMS accepted the new cells without fault codes. Cell voltage across the pack balanced within spec at full charge.
- Pre-election conditioning: Run a full power-cycle test — power the machine on battery only, let it reach operational standby, then restore AC — before deploying to a polling location. The charge controller recalibrates its low-battery threshold during this sequence, and skipping it causes false low-battery alerts mid-election.
Why the AccuVote-TSX rejects a new pack after the battery sat in storage
Ni-MH cells self-discharge during storage. If the pack voltage drops below roughly 10V, the AccuVote-TSX charge controller sees it as a fault condition rather than a discharged battery. The controller then refuses to initiate a charge cycle. A short trickle-charge session at low current — some external chargers call this a "recovery" or "reconditioning" mode — brings the pack voltage back above the controller's acceptance threshold before you connect it to the machine.
Touch screen freezes or resets during active ballot session on battery power
The touch digitiser and display backlight together draw a sustained load that aging or partially discharged cells cannot hold steady. When cell voltage sags under that combined draw, the machine's internal regulator hits its lower limit and the processor resets. This is not a software fault — it is a voltage dropout event. Confirm the replacement pack reads at or above 13.8V immediately after a full charge cycle before placing the machine in service.