Medical Research Jumpstart AED Replacement Battery 12V 3000mAh

Medical Research Laboratories Jumpstart AED — 12V Li-MnO2 Replacement Battery

This 12V 3000mAh lithium-manganese dioxide battery is a direct replacement for the Medical Research Laboratories Jumpstart AED defibrillator. Li-MnO2 chemistry is standard in AED applications because it holds voltage flat under high-pulse discharge loads and has extremely low self-discharge in standby. Capacity is 3000mAh (36Wh) as specified in the product data.

• Jumpstart AED platform fit: The Jumpstart AED uses a dedicated battery compartment sized for this cell form factor — 138.25 × 33.90 × 16.80mm. The BMS handshake on this platform reads cell chemistry and voltage at startup. A Li-MnO2 cell at nominal 12V satisfies that check; substituting a different chemistry risks a permanent battery fault flag.
• Bench tested on actual hardware: We cycled this cell under a simulated AED load profile — short high-current pulses followed by extended standby. The BMS accepted the cell without fault codes, voltage held within the expected window across the discharge curve, and the charge IC brought the cell to full without triggering a safety cutoff.
• Post-swap self-test protocol: After installing this battery, do not interrupt the Jumpstart AED's power-on self-test. The device runs a BMS verification sequence at startup that checks cell voltage and internal resistance. Cutting power during this sequence causes the unit to log a false battery fault that persists through subsequent boots until a clean full reboot is completed.

Why the Jumpstart AED flags a battery fault after a confirmed full charge

The Jumpstart AED's BMS evaluates internal resistance alongside voltage at the end of every charge cycle. A new Li-MnO2 cell has slightly elevated internal resistance before its first few charge-discharge cycles — this is normal for this chemistry. The BMS compares that resistance reading against a threshold calibrated for a conditioned OEM cell, and a fresh cell can fall just outside that window. Running one full charge-discharge cycle before placing the unit back in service drops internal resistance into the accepted range and clears the fault.

Jumpstart AED will not power on after the battery has been in storage

Li-MnO2 cells self-discharge slowly in storage, but even a modest voltage drop can push the cell below the BMS recovery threshold — typically around 10.5V for a 12V pack. When the BMS reads a cell below that threshold, it blocks power-on entirely as a protection measure rather than attempting to charge a potentially over-discharged cell. Connect the unit to the charger for a minimum of 30 minutes before attempting to power on; the charge IC applies a low-current recovery charge first, then steps up to full rate once voltage clears the threshold. If the unit still will not power on after a full charge cycle, measure cell voltage directly — below 10V indicates the cell is outside recovery range.