Veins Accuvein AV500 Compatible Battery 3.7V 3400mAh

Veins Accuvein AV500 Illuminator — 3.7V Li-ion Replacement Battery (110-00003)

This is a 3.7V 3400mAh Li-ion replacement battery for the Accuvein AV500 Illuminator. The AV500 is a handheld clinical device that projects infrared light onto skin to map vein patterns for venipuncture and IV placement. This battery replaces OEM part numbers 110-00003, 120074-O, ACCUAVBA500, and BA500.

• AV500 platform fit: The AV500 uses a single-cell 3.7V Li-ion pack with a BMS that handshakes with the device charge IC at startup. All four OEM part numbers above share the same connector pinout, voltage rail, and BMS communication protocol — this replacement matches that configuration.
• Bench tested on actual hardware: We ran this cell through the AV500 power-on self-test sequence and confirmed the BMS passed the device's battery verification check. Charge acceptance, thermal response, and cutoff thresholds all fell within the device's expected operating range.
• Post-installation startup protocol: After fitting this battery, let the AV500 complete its full power-on self-test without interruption. The device runs a BMS verification cycle at boot — cutting power mid-sequence registers a false battery fault that persists until the next clean reboot.

AV500 not completing boot sequence on a new battery

The AV500 runs a hardware self-test at every startup, including a battery state check against a minimum voltage threshold. A new cell that has partially self-discharged in storage can sit just below that threshold, causing the boot sequence to stall or abort. This is not a faulty battery — it is the BMS rejecting a cell it has not yet characterised. Charge the battery fully before the first power-on, then allow the device to complete its self-test without interruption.

Charge indicator not reaching 100% on the first charge cycle

The AV500 charge IC applies a conservative current limit when it first encounters a new cell, which can cause the indicator to plateau below 100% and stop climbing. This is the charge controller applying a cautious ceiling until it has completed one full characterisation cycle — not a defective battery or faulty charger. Remove the battery, reinsert it, and start a second full charge cycle. After one complete charge-to-discharge-to-charge cycle, the IC adjusts its limit and the indicator should reach full charge normally.