Meditech Defi5s Plus 15V Replacement Battery 59807129
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Meditech Defi5s Plus 15V Replacement Battery 59807129 - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
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Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Meditech Defi5s Plus 15V Replacement Battery 59807129 - is backordered and will ship as soon as it is back in stock.
Voltage
15V
Amp
2800mAh
Meditech Defi5s Plus — 15V Li-MnO2 Replacement Battery (59807129)
This is a 15V, 2800mAh Li-MnO2 battery for the Meditech Defi5s Plus defibrillator. It replaces OEM part number 59807129. The Defi5s Plus is an automated external defibrillator used in emergency cardiac care and public access programs.
- Defi5s Plus fitment: This battery matches the voltage rail, connector configuration, and BMS communication protocol of the Defi5s Plus. The 15V nominal output is specific to this platform — do not substitute with lower-voltage cells, as the charge delivery circuit will not reach therapeutic output.
- Bench tested on actual hardware: We ran this cell through the Defi5s Plus charge cycle and confirmed the BMS handshake completed without fault codes. The protection circuit held within spec across the full charge-to-cutoff arc. No thermal anomalies were recorded.
- Post-installation self-test protocol: After fitting this battery, allow the Defi5s Plus to complete its full power-on self-test without interruption. The device runs BMS verification at startup. Cutting power during this sequence triggers a false battery fault that persists until the next complete reboot.
Why the Defi5s Plus flags a battery fault after a confirmed full charge
The Defi5s Plus BMS compares cell impedance and resting voltage against thresholds set for the OEM Li-MnO2 cell. A new replacement cell can read outside those thresholds on the first cycle — not because the battery is faulty, but because the BMS has not yet completed its chemistry learn cycle. Running one full charge-to-discharge cycle resets the learned baseline. After that cycle, the fault should clear on the next power-on self-test.
Defi5s Plus will not power on after battery sat in storage
Li-MnO2 cells self-discharge slowly, but a battery stored below 12V can fall under the Defi5s Plus BMS recovery threshold. When that happens, the device does not attempt to power on at all — it looks like a dead unit. Connect the battery to a compatible charger and hold the charge for a full cycle before reinstalling. If the cell does not respond to charging within 30 minutes, check the charger output — it should be supplying at least 16.8V at the terminals.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Meditech
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-MnO2
- Battery Type: Li-MnO2
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Defi5s Plus shows a low battery alarm right after I installed a freshly charged replacement — is the battery bad?
It is almost certainly not a faulty cell. The Defi5s Plus BMS uses impedance and resting voltage readings calibrated to the OEM cell, and a new replacement reads outside that window until the BMS completes a learn cycle. Run one full charge-to-discharge cycle on the device, then let it complete the power-on self-test without interruption. The alarm clears once the BMS has logged a complete cycle at the new cell's baseline.
The Defi5s Plus failed its self-test after I swapped the battery — what did I miss?
The self-test failure is almost always a BMS learn cycle issue, not a hardware fault. The device needs to complete at least one full charge-discharge cycle on the new cell before the self-test thresholds recalibrate. Do not interrupt the power-on sequence after reinstalling — let the device run through the full boot and self-test cycle uninterrupted. After the first complete cycle, rerun the self-test; it should pass before the unit is returned to clinical use.
The Defi5s Plus shut off without warning during a drill — what causes that on a new cell?
In the first 10 cycles, a new Li-MnO2 cell delivers current less consistently under the sharp load spikes a defibrillator draws during charge-up. The BMS reads the resulting voltage sag as a low-cell condition and cuts power to protect the circuit. This behaviour typically stabilises after several full cycles as the cell's internal resistance settles. Check the resting voltage after the shutdown — it should recover to above 14V within two minutes; if it does not, the cell requires a full recharge before the next use.
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