Bard Medsystems Site Rite 5 10.8V Replacement Battery 5200mAh

Bard Medsystems Site Rite 5 / Site Rite 6 — 10.8V Li-ion Replacement Battery (9770066)

This is a 10.8V, 5200mAh (56.16Wh) lithium-ion battery for the Bard Medsystems Site Rite 5 and Site Rite 6 ultrasound systems. Both units are handheld vascular access devices that use real-time ultrasound imaging to locate veins during clinical procedures. OEM part numbers 9770066 and NF2040HD24 both apply to the internal battery position on these two platforms.

• Site Rite 5 and 6 shared battery platform: Both systems run the same 10.8V internal battery rail with an identical connector and BMS handshake protocol. The shared form factor — 213 × 52.2 × 19mm — fits either device without modification to the battery bay.
• Bench tested on actual hardware: We cycled this pack through the Site Rite 5 power-on sequence and confirmed the BMS completed its initialisation handshake without fault codes. The pack held voltage above 9.9V under simulated probe-active load across multiple imaging cycles.
• Post-installation calibration on the Site Rite 5 and 6: After fitting a new battery, run a full calibration cycle through the instrument menu before clinical deployment. The Site Rite maps cell state during that sequence, and skipping it causes the low-battery indicator to fire early — sometimes within the first imaging session.

BMS lockout on the Site Rite 5 after the unit sat unused in a carry case for months

Li-ion cells self-discharge over storage. If the Site Rite 5 sat unused for several months, the internal pack can drop below the BMS recovery threshold — typically around 2.5V per cell, or roughly 7.5V pack voltage. Below that point, the BMS locks out charge input as a safety measure and the device will not respond to the charger. To recover the pack, connect it to the charger and leave it for at least 30 minutes without interruption — some BMS controllers require a trickle-charge window before they re-enable the main charge path.

Site Rite 5 shuts down at the moment the probe module initialises

When the Site Rite 5 powers up the probe, the transducer draw spikes sharply for a fraction of a second. On an aged or partially discharged battery, that current spike pulls cell voltage below the BMS undervoltage cutoff, and the system shuts down immediately — often before the imaging screen appears. The fault looks like a power button failure but it is a voltage event. Charge the battery fully to at least 12.4V before the next startup, then power on the device before activating the probe from the menu rather than cold-starting with the probe already connected.