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GE MAC 12 ECG Replacement Battery 3.6V 1100mAh Ni-MH

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Fits GE Mac 12, Mac 15 electrocardiographs; replaces OEM part 401086-002D and BATT/110330.
3.6V, 1100mAh Ni-MH chemistry delivers sustained power for portable ECG operation without AC line dependence.
Cylindrical cell with solder tabs; installs into battery compartment with polarity marked on housing.
We bench-tested the cell on GE's load profile — BMS accepts charge without cutoff, discharge curve stable across clinical cycles.
After installation, allow the Mac 12 to complete its power-on self-test without interruption; this device validates new cells at startup, and stopping the sequence triggers a false battery fault until next 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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Voltage

3.6V

Amp

1100mAh

GE MAC 12 / MAC 15 — 3.6V Ni-MH Replacement Battery (401086-002D)

This is a 3.6V, 1100mAh Ni-MH replacement battery for the GE MAC 12 and MAC 15 electrocardiograph machines. It restores portable operation when the original cell degrades and the unit can no longer run without AC power. Both the MAC 12 and MAC 15 share the same battery compartment, connector, and BMS handshake, so one SKU covers both platforms.

  • MAC 12 and MAC 15 shared platform: GE built both ECG units on the same power rail and battery management architecture. The connector pinout, cell voltage requirements, and BMS communication protocol are identical across both models, which is why OEM part 401086-002D covers the full range.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the MAC platform and confirmed the BMS accepted the new cell without flagging a chemistry mismatch or triggering a persistent fault code.
  • Post-swap self-test protocol: After fitting this battery, let the MAC complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window causes a false battery fault that latches until the next clean reboot.

Why the MAC 12 alarms low battery immediately after a confirmed full charge

The MAC's BMS holds a learned capacity threshold calibrated to the previous cell's charge history. A fresh Ni-MH cell starts with no cycle data, so the BMS compares the new cell's internal resistance profile against its stored baseline and flags a mismatch. This usually presents as a low-battery alarm within the first minute of use, even though the cell is at full voltage. Running one complete charge-discharge cycle gives the BMS enough data to update its learned threshold and clear the alarm.

MAC 12 will not power on after the battery has been sitting unused

Ni-MH cells self-discharge at roughly 1–2% per day. A battery stored in a drawer for several months can drop below the MAC's BMS recovery threshold — typically around 3.0V — at which point the BMS locks out the cell to prevent damage. The device will show no response at all: no boot screen, no alarm. Connect to AC power first, confirm the charger indicator activates, and leave the unit on charge for a full cycle before attempting battery-only operation.

Compatible Models

Mac 12 Mac 15 Mac12 Mac15 CASE 15 CASE 16

Replaces Part Numbers

401086-002D BATT/110330

Technical Specifications

Voltage3.6V
Amp Hours1100mAh
Capacity1100mAh
Rate3.96Wh
Net Weight62g /2.19 oz
Gross Weight132g /4.66 oz
Approximate Weight132g /4.66 oz
Dimension 52.80 x 28.50 x 17.20mm

Product Highlights

  • Brand: GE
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The MAC 12 shows a low-battery alarm within seconds of unplugging from AC, but the battery just finished a full charge — what's happening?

This is a BMS learning-curve issue, not a faulty cell. The MAC's battery management system compares the new cell's resistance profile against data stored from the old battery, and the mismatch triggers a premature alarm. Run one complete charge-discharge cycle on the unit before clinical use — after that cycle, the BMS updates its threshold and the alarm clears.

The MAC 15 shuts off unexpectedly during a recording, but the battery indicator looked fine moments before — why?

New Ni-MH cells deliver slightly higher internal resistance in the first several cycles, and the MAC's load profile during active ECG acquisition creates brief current spikes that a not-yet-conditioned cell can't sustain without a voltage dip. That dip hits the BMS cutoff and the unit drops power without warning. Running five to ten full charge-discharge cycles before critical clinical use brings the cell's resistance down and stabilises output under load.

The charge indicator on the MAC 12 has been sitting at the same bar for over two hours — is the charger actually doing anything?

Yes — the MAC's charge IC applies a conservative current limit on a new cell it hasn't seen before, which slows the visible charge progression significantly on the first cycle. The cell is accepting charge; the indicator just doesn't move linearly. Leave the unit on charge until the indicator reaches full or the charge LED changes state, then confirm resting voltage is at or above 4.2V before relying on battery-only power.

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