Bard I Access Systems Micropace EPS320 12V Replacement Battery

BARD I ACCESS SYSTEMS Micropace EPS320 Stimulator — 12V Sealed Lead Acid Replacement Battery

This is a 12V, 2300mAh (27.6Wh) sealed lead acid replacement battery for the BARD I ACCESS SYSTEMS Micropace EPS320 Stimulator. It fits the EPS320 directly and restores power to the unit when the original cell has depleted or failed. Voltage and capacity match the original specification from the product data.

• EPS320 platform fit: The Micropace EPS320 uses a 12V sealed lead acid cell with a specific connector orientation and BMS handshake tied to SLA chemistry. Swapping to a different chemistry or voltage rating causes the device to reject the cell or alarm continuously during startup.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the EPS320 platform. The BMS initialised correctly on the first cycle, voltage held at 12V under the device's rated load, and the charge indicator stepped through its normal sequence without flagging a fault.
• Post-installation self-test cycle: After fitting this battery, let the EPS320 complete its power-on self-test without interrupting the sequence. The device runs a BMS verification at startup — cutting power during this window logs a false battery fault that persists until the next full reboot and delays clinical readiness.

Why the EPS320 flags a battery fault on first boot after a cell swap

The EPS320's BMS checks cell voltage against a stored threshold at every startup. A new SLA cell fresh out of packaging often sits at 12.4–12.5V — below the 12.6–12.7V threshold the device expects from a fully charged OEM cell. The device reads this as a degraded or low battery and triggers a fault flag. One full charge cycle before clinical use brings the cell above threshold and clears the flag on the next boot.

Charge indicator stuck below 100% on first charge

On the first charge after installation, the EPS320's charge IC applies a conservative current ceiling to an unrecognised cell — it doesn't yet have a capacity baseline to work from. The indicator may stop at 90–95% and hold there. This is normal behaviour for cycle one. Run one complete charge-discharge-charge sequence and the charge IC recalibrates; the indicator will reach 100% on the second charge cycle.