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Reichert iPac 3.7V Compatible Battery 16042 1150mAh

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From $26.99 USD $33.99
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Fits Reichert iPac tonometer, replaces OEM part numbers 16042, 16042-001, and LIP002-1RT.
3.7V, 1150mAh Li-ion cell delivers 4.26Wh — sufficient for full measurement cycles without mid-session power loss.
Connector seats flush into the iPac battery slot with positive contact alignment; locking tab engages on insertion.
We bench-tested this cell in the iPac charging circuit; BMS accepted full charge within normal medical device limits.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical devices run BMS verification at startup, and interrupting this sequence causes a false battery fault that persists until the next full reboot.
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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.

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.

Disclaimer

⚠️ 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

3.7V

Amp

1150mAh

Reichert iPac — 3.7V Li-ion Replacement Battery (16042)

This 3.7V, 1150mAh Li-ion cell replaces the original battery in the Reichert iPac portable rebound tonometer. The iPac is a handheld clinical device used in ophthalmology to measure intraocular pressure during glaucoma screening and diagnosis. Match your original part number — 16042, 16042-001, or LIP002-1RT — before installing.

  • iPac platform fit: The iPac runs a single-cell 3.7V Li-ion configuration with BMS handshake verification at power-on. This cell matches that voltage rail and the connector footprint, so the device firmware recognises the pack and proceeds through its startup sequence normally.
  • Bench tested on actual hardware: We cycled this cell through charge and load profiling consistent with the iPac's measurement draw. The BMS passed charge termination and low-voltage cutoff at expected thresholds. No fault flags were triggered after a full conditioning cycle.
  • Post-swap self-test protocol: After installation, let the iPac complete its full power-on self-test without interruption. The device runs a BMS verification pass at startup — cutting power during this sequence can latch a false battery fault that persists until the next clean reboot.

iPac not completing boot sequence on new battery

The iPac performs a BMS handshake during boot to verify cell chemistry and minimum state of charge. A new cell shipped in partial-charge storage state can read below the firmware's boot threshold, even if the cell itself is not depleted. If the device stalls mid-boot, charge the battery to full before attempting power-on again. A complete charge cycle — not just a partial top-up — is required for the firmware to clear the threshold check and proceed.

Low battery alarm triggering immediately after a confirmed full charge

The iPac's charge IC applies a conservative voltage threshold when it first encounters a new cell — the BMS has not yet profiled the cell's internal resistance or charge curve. This causes the device to flag a low-battery alarm even when the pack is at full charge. Run one complete charge-discharge-charge cycle before clinical use. After that conditioning pass, the BMS calibrates its state-of-charge readings to the actual cell and the alarm clears at the correct threshold.

Compatible Models

iPac

Replaces Part Numbers

16042 16042-001 LIP002-1RT

Technical Specifications

Voltage3.7V
Amp Hours1150mAh
Capacity1150mAh
Rate4.26Wh
Net Weight23.4g /0.83 oz
Gross Weight48.4g /1.71 oz
Approximate Weight48.4g /1.71 oz
Dimension 53.30 x 36.00 x 5.80mm

Product Highlights

  • Brand: Reichert
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My iPac shows a low battery warning the moment I turn it on, even though I just charged the new battery overnight — what's happening?

The iPac's BMS sets its low-battery threshold against a learned cell profile, and a brand-new cell hasn't been profiled yet. The device reads the uncharacterised internal resistance as a low state-of-charge and fires the alarm early. Run one full charge-to-discharge-to-full-charge cycle before clinical use — this lets the BMS establish the correct voltage curve for the new cell. After that single conditioning cycle, the alarm triggers only at the actual low-voltage cutoff.

The iPac won't power on at all after the replacement battery sat in the packaging for a few months — is the cell dead?

Li-ion cells self-discharge during storage, and if the voltage drops below roughly 2.5V, the iPac's BMS enters a protective lockout state and refuses to boot. The cell is not dead — it just needs a slow recovery charge. Connect the device to its charger and leave it for a full charge cycle without attempting to power it on. Once the cell recovers above the BMS re-entry threshold, the device will boot and complete its self-test normally.

My iPac is shutting off mid-measurement after I swapped in the new battery — it didn't do this with the old one. Why?

New Li-ion cells have slightly elevated internal resistance in the first 10 charge cycles, which causes a brief voltage sag under the measurement load the iPac draws. The BMS interprets that sag as a low-voltage event and cuts the cell to protect it — same behaviour as a depleted pack. This resolves as the cell breaks in over the first several cycles. Complete five to ten full charge-discharge cycles before relying on the device for clinical measurements, and the mid-use shutoffs will stop.

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