B. BRAUN 620-200 Infusion Pump Replacement Battery 12V 2300mAh

B. BRAUN 620-200 Safety Infusion System — 12V Sealed Lead Acid Replacement Battery

This is a 12V 2300mAh (27.6Wh) sealed lead acid battery for the B. BRAUN 620-200 Safety Infusion System and compatible models including the Outlook 200, 620-100, and Outlook 100. It powers the pump during disconnection from mains supply, allowing continued medication or fluid delivery. Capacity figures come from the product data, not estimated from third-party sources.

• 620-200, Outlook 200, 620-100, Outlook 100 compatibility: These four infusion pump models share the same 12V internal bus voltage and the same physical battery bay dimensions. The sealed lead acid chemistry matches the charge profile the onboard charge IC expects — substituting a lithium cell here would trip the charge controller and generate a persistent fault.
• Bench tested on actual hardware: We cycled this cell through charge and load discharge on the bench. The BMS accepted the cell without fault on first insertion, the charge IC stepped through bulk, absorption, and float phases correctly, and terminal voltage held within the expected window under pump load.
• Post-swap startup procedure for infusion pumps: After installing this battery, allow the device to complete its full power-on self-test cycle without interruption. The pump runs a BMS verification sequence at startup. Cutting power during that sequence can lock in a false battery fault that persists until the next clean reboot.

Why the 620-200 alarms low battery immediately after a confirmed full charge

The 620-200 uses a BMS threshold calibrated to the charge curve of a conditioned cell. A new sealed lead acid battery straight from storage has not yet established its full electrochemical surface area, so its resting voltage sits slightly below the threshold the BMS uses to confirm a healthy charge state. The alarm fires not because the cell is faulty, but because the BMS is reading a voltage that doesn't yet match its internal pass criteria. Running one full charge-to-load-discharge cycle resolves this — terminal voltage after that first cycle will clear the threshold and the alarm will not return.

Pump not completing boot sequence after battery replacement

If the pump starts its boot sequence and then halts — either displaying a battery fault or cutting off entirely — the cell voltage at rest is likely below the BMS recovery floor. Sealed lead acid cells self-discharge during storage, and if the stored voltage has dropped below approximately 11.8V, the charge controller on the 620-200 will refuse to proceed through startup. Connect the pump to mains power and allow it to charge uninterrupted for a full cycle before attempting to boot on battery alone. Once the cell returns above 12.0V resting voltage, the boot sequence will complete normally.