About this replacement
IMEX Versalab Vascular Doppler — 7.2V Ni-MH Replacement Battery (BT0029)
This 7.2V, 2000mAh Ni-MH battery replaces the OEM pack in the IMEX Versalab Vascular Doppler and compatible units including the Summit Doppler, Nicolet Vascular, and Viasys platforms. It matches the original voltage rail and connector profile so no hardware modification is needed. Capacity is rated at 14.4Wh, matching the OEM specification for these portable clinical Doppler units.
- Cross-platform fit — Versalab, Summit, Nicolet, Viasys: These vascular Doppler units share a common 7.2V battery architecture and the same BMS handshake protocol. OEM part numbers BT0029, BAT0004, BT-U029, B11616, and 6196 all refer to the same physical pack — this battery covers all of them.
- Bench tested on actual hardware: We cycled this pack through a full charge-discharge sequence on a Versalab-class unit and monitored the BMS response at startup. The protection circuit engaged correctly at low-voltage cutoff and the charge IC accepted a full charge without flagging a fault on the second cycle.
- Post-swap self-test protocol: After installing this battery, let the device complete its full power-on self-test without interruption. The Versalab BMS runs a chemistry verification step at boot. Cutting power during that sequence writes a false fault flag that persists until the next clean reboot.
Low battery alarm triggering immediately after a confirmed full charge
The Versalab's BMS uses stored discharge curves calibrated to the OEM cell's internal resistance profile. A new replacement cell has a slightly different impedance signature on the first few cycles, which the BMS interprets as a depleted pack even when state-of-charge is high. This is not a fault with the battery. Run one complete charge-discharge cycle without interrupting the device mid-use, and the BMS recalibrates its threshold against the new cell's actual curve. After that cycle, the alarm threshold tracks correctly.
Device will not power on after battery was stored before installation
Ni-MH cells self-discharge at roughly 1–2% per day in storage. If this battery sat in a warehouse or drawer for several months before installation, its resting voltage may have dropped below the BMS recovery threshold — typically around 6.0V for a 7.2V Ni-MH pack. The protection circuit blocks output to prevent damage, so the device shows no response at power-on. Place the battery on charge for a minimum of 30 minutes before attempting to boot the device; most charge ICs on this platform apply a trickle recovery current that brings the cell above the 6.0V floor before switching to full charge rate.