Fluke 4600 Defibrillator Replacement Battery 12V 2300mAh

Fluke 4600 Defibrillator — 12V Sealed Lead Acid Replacement Battery

This is a 12V, 2300mAh (27.6Wh) sealed lead acid battery for the Fluke 4600 Defibrillator and compatible medical test equipment. It also fits the Impulse 4000, RF303 Electrosurgery Analyzer, and Data Simulator 6100. Voltage and terminal configuration match the original specification.

• 4600 Defibrillator and analyzer platform: These devices share a 12V SLA architecture with identical terminal layout and BMS voltage thresholds. The same cell services the defibrillator charge circuit, the Impulse 4000 load bank, and the RF303 analyzer without modification.
• Bench tested on actual hardware: We cycled this cell through the 4600's charge controller and monitored BMS handshake at startup. The controller accepted the cell, completed the initialization sequence, and held voltage within spec under simulated discharge load.
• Power-on self-test protocol: After fitting this battery, allow the 4600 to complete its full power-on self-test without interruption. The device runs a BMS verification pass at boot — cutting power mid-sequence triggers a false battery fault flag that persists until the next clean reboot cycle.

Self-test failure after battery swap on the Fluke 4600

The 4600's onboard diagnostics check resting voltage and internal resistance against stored OEM thresholds during each self-test. A new SLA cell that has not completed its first full charge-discharge cycle will present slightly elevated internal resistance. The BMS reads this as a fault and fails the self-test even when the cell is fully charged. Run one complete charge-discharge cycle before treating a self-test failure as a genuine fault.

Charge indicator stalls below 100% on first charge

SLA charge controllers apply a conservative absorption voltage ceiling on cells with no prior cycle history. The 4600's charge IC holds the cell at float voltage longer than usual when it cannot confirm cell capacity from a previous cycle. This looks like a stuck charge indicator but is normal first-cycle behaviour. After one full discharge to approximately 10.5V and a complete recharge, the indicator will read correctly on subsequent cycles.