Siemens 4834789 Sonoline Antares Compatible Battery 4.8V 3600mAh

Siemens Sonoline Antares / ACUSON S2000 — 4.8V Ni-MH Replacement Battery (4834789)

This 4.8V 3600mAh Ni-MH battery replaces the internal backup cell in the Siemens Sonoline Antares Ultrasound, Sonoline Antares S-2000, and ACUSON S2000 portable diagnostic systems. It maintains system state, supports the real-time clock, and powers the BMS handshake that allows the unit to complete its power-on self-test. Dimensions are 136.20 x 34.80 x 17.00mm — match these before installing.

• Sonoline Antares and ACUSON S2000 platform fit: These models share the same 4.8V battery rail, connector pinout, and BMS communication protocol. OEM part numbers 4834789, 110382, and 6289 all reference the same cell specification across production runs of this platform.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Sonoline Antares platform. The BMS accepted the new cell without fault codes, and the charge IC stepped through each stage correctly without triggering an early cutoff.
• Power-on self-test after installation: After fitting the new battery, let the unit run its full startup sequence without interruption. The Sonoline Antares BMS runs a verification check at boot — cutting power mid-sequence flags a battery fault that persists until the next complete reboot cycle.

Why the Sonoline Antares triggers a low-battery alarm after a confirmed full charge

The Sonoline Antares BMS stores a capacity model calibrated to the original OEM cell's charge curve. A new Ni-MH cell has a slightly different voltage profile during the first few cycles, and the BMS reads this as a capacity shortfall. The alarm clears after one complete charge-discharge cycle, which lets the BMS update its internal model to match the new cell. Do not use the unit clinically until that first full cycle is complete and the alarm stays clear.

Unit will not power on after replacement cell sat in storage

Ni-MH cells self-discharge during storage, and if voltage drops below approximately 3.6V the Sonoline Antares BMS locks out power-on as a protection measure. Placing the unit on charge for a full uninterrupted cycle is usually enough to bring the cell above the recovery threshold. If the charge indicator does not advance within 30 minutes, disconnect and reconnect the charger to force the charge IC to re-poll the cell voltage. The unit should power on normally once the cell reads above 4.2V at rest.