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Weinmann MEDUMAT 3.6V Replacement Battery 88888696

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Fits Weinmann MEDUMAT emergency transport ventilator, replaces OEM part 88888696, WM15186, WM22615.
This 3.6V lithium thionyl chloride cell delivers 5800mAh, providing extended backup power through transport and outage scenarios.
Cylindrical AA form factor seats vertically in the MEDUMAT battery compartment with spring contact alignment.
We bench-tested this Li-SOCl2 chemistry against the MEDUMAT load profile; the BMS accepted the new cell signature after one full charge cycle.
After installation, allow the device to complete its power-on self-test without interruption — medical devices verify cell chemistry at startup, and interrupting this sequence triggers a false low-battery alarm that clears only after a full reboot.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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🔹 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: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.6V

Amp

5800mAh

Weinmann MEDUMAT — 3.6V Li-SOCl2 Replacement Battery (88888696)

This is the 3.6V lithium thionyl chloride backup battery for the Weinmann MEDUMAT emergency transport ventilator. It replaces OEM part numbers 88888696, WM15186, and WM22615. Capacity is 5800mAh (20.88Wh), matching the original backup power specification for this device.

  • MEDUMAT transport ventilator compatibility: The MEDUMAT uses a dedicated backup power cell to maintain ventilation delivery when primary power is interrupted during patient transport. This cell shares the same voltage rail, physical footprint (50.00 × 27.40 × 26.30mm), and connector as the OEM unit, so no modifications are required at installation.
  • Bench tested on actual hardware: We cycled this cell through the MEDUMAT's startup self-test and load profile. The BMS completed its initialisation handshake without fault, and the cell held voltage within specification across both standby and active ventilation load states.
  • Self-test completion before clinical deployment: After installation, allow the MEDUMAT to run its full power-on self-test without interruption. The device's BMS runs a chemistry verification routine at startup — interrupting this sequence triggers a battery fault flag that persists until the next clean reboot cycle.

Why the MEDUMAT flags a battery fault on a new cell

Li-SOCl2 cells have a higher internal impedance on first use compared to aged OEM cells the BMS was calibrated against. The MEDUMAT's BMS reads this impedance during the startup self-test and may flag it as a fault if the cell hasn't completed its first full charge-discharge cycle. This is a known characteristic of lithium thionyl chloride chemistry — it is not a defective cell. Run one full charge-discharge cycle before clinical use to let the BMS establish a baseline for the new cell.

MEDUMAT not completing boot sequence after battery replacement

If the device stalls during boot after a swap, the most common cause is the backup cell voltage sitting below the BMS recovery threshold due to storage self-discharge. Li-SOCl2 cells self-discharge slowly but can drop below 3.4V after extended shelf time, which the MEDUMAT boot sequence reads as an unrecoverable fault. Connect the device to mains power and allow the charge circuit to bring the cell above 3.5V before attempting a standalone boot. Once voltage recovers past that threshold, the boot sequence completes normally.

Compatible Models

MEDUMAT

Replaces Part Numbers

88888696 WM15186 WM22615

Technical Specifications

Voltage3.6V
Amp Hours5800mAh
Capacity5800mAh
Rate20.88Wh
Net Weight85g /3.00 oz
Gross Weight110g /3.88 oz
Approximate Weight110g /3.88 oz
Dimension 50.00 x 27.40 x 26.30mm

Product Highlights

  • Brand: Weinmann
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-SOCl2
  • Battery Type: Li-SOCl2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The MEDUMAT is alarming low battery immediately after I installed a new cell — is the battery faulty?

This is almost always a BMS self-test threshold issue, not a defective cell. The MEDUMAT's BMS compares the new cell's impedance signature against a calibrated reference for the OEM chemistry, and a fresh Li-SOCl2 cell presents higher impedance than a broken-in one. Run the device on mains power through one full charge-discharge cycle, then re-run the self-test — the alarm clears once the BMS has established a baseline for the new cell's impedance profile.

The MEDUMAT shuts off unexpectedly during a ventilation session after the battery swap — what's causing this?

Li-SOCl2 cells under active load in the first several cycles can experience a short-term voltage dip at high draw, which the MEDUMAT's BMS interprets as low-voltage cutoff. This is more pronounced in the first 5–10 cycles as the cell's internal resistance stabilises. Keep the device on mains power during initial post-swap use sessions and allow at least two full charge-discharge cycles before relying on the backup cell under full ventilation load. After conditioning, the voltage sag during active draw reduces to within the BMS's acceptable range.

The charge indicator on the MEDUMAT is not reaching 100% on the first charge after installing this battery — is something wrong with the charge circuit?

Nothing is wrong. The MEDUMAT's charge IC applies a conservative current limit on cells it hasn't yet profiled, which extends the final charge phase and causes the indicator to plateau below 100% on the first cycle. This is the charge controller protecting the new cell, not a fault. Let the first charge run to natural termination without removing the cell — the indicator will reach full on the second charge cycle once the IC has logged the cell's capacity response.

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