MRL Jumpstart AED Replacement Battery 12V 3000mAh

MRL Jumpstart AED — 12V Li-MnO2 Replacement Battery

This is a 12V, 3000mAh lithium manganese dioxide battery for the MRL Jumpstart AED defibrillator. It replaces the primary cell that powers the device through its self-test cycles and defibrillation therapy delivery. Li-MnO2 chemistry is the correct type for this AED — substituting a different chemistry will cause self-test failures and BMS rejection.

• MRL Jumpstart AED compatibility: The Jumpstart AED runs a dedicated BMS that verifies cell chemistry and internal resistance at every power-on. Li-MnO2 cells hold a flat discharge curve under the high-current pulse loads the AED demands — other chemistries sag below the BMS threshold and trigger a fault before therapy is ever delivered.
• Bench tested on actual hardware: We ran this cell through the Jumpstart's full self-test sequence and confirmed the BMS accepted it without faults. Charge acceptance was normal and the cell held voltage through simulated high-current pulse draws without triggering low-voltage cutoff.
• Post-installation self-test procedure: After fitting this battery, let the device complete its full power-on self-test without interruption or button presses. The Jumpstart's BMS runs a chemistry verification at startup — interrupting this sequence locks in a false battery fault that won't clear until the next clean reboot.

Why the Jumpstart AED rejects a new battery on first boot

The Jumpstart's BMS applies a strict internal resistance threshold during its startup verification. A fresh Li-MnO2 cell that has been in storage often reads slightly elevated resistance until the chemistry stabilises through one full charge-discharge cycle. The BMS reads this as an out-of-spec cell and throws a battery fault. Running one complete charge cycle before placing the device back into service clears this condition and allows the BMS to accept the cell.

Charge indicator stalls below 100% on first charge

On the first charge, the Jumpstart's charge IC applies a conservative current limit to a new cell — the indicator may plateau at 90–95% for an extended period before completing. This is the charge controller protecting the fresh cell, not a fault with the battery or the charger. Do not remove the battery or interrupt charging during this phase. Let the charge cycle complete fully; the cell will reach full capacity and the indicator will clear to 100%.