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1ICP4/23/27 Li-Polymer Compatible Battery 3.85V 240mAh

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Replaces OEM part number 1ICP4/23/27 in compact Li-Polymer devices requiring 3.85V single-cell power sources.
3.85V nominal with 240mAh capacity delivers 0.92Wh — sufficient for extended runtime in low-drain portable equipment.
Connector and locking tab match OEM specification; 27.60 x 23.00 x 4.00mm form factor seats flush in original battery slot.
Bench testing confirmed BMS accepts charge cycle without voltage sag; cell delivered full capacity on second discharge after initial conditioning.
On first install, run one complete charge-discharge cycle before relying on the device's fuel gauge — integrated charge counters require calibration against new cell voltage after any battery swap.
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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

3.85V

Amp

240mAh

Custom Battery Pack 1ICP4/23/27 — 3.85V Li-Polymer Replacement Battery

This is a 3.85V 240mAh (0.92Wh) Li-Polymer replacement battery carrying OEM part number 1ICP4/23/27. It is a compact flat-cell pack measuring 27.60 × 23.00 × 4.00mm, suited to small electronics where space is tightly constrained. It replaces original packs that no longer hold adequate charge or have failed entirely.

  • Compact cell format: At 4.00mm thick and under 28mm in length, this cell targets devices with minimal internal clearance. The flat Li-Polymer pouch construction matches the form factor of the original 1ICP4/23/27 specification — connector orientation and dimensions must be confirmed against your original pack before fitting.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench, monitoring the BMS cutoff thresholds and cell voltage under load. The pack held within the expected voltage range throughout, and the protection circuit tripped cleanly at both high and low voltage limits.
  • First-cycle calibration: If your device uses an integrated fuel gauge, run one full charge-discharge cycle immediately after swapping this pack. The gauge IC needs to measure the new cell's actual capacity curve before its percentage readout becomes trustworthy.

Pack running at lower voltage than rated on first installation

Li-Polymer cells ship at storage voltage — typically 3.70V to 3.80V — not at full charge. If your device reads low battery or behaves unexpectedly immediately after fitting, that is why. The cell has not been degraded; it simply has not been charged yet. Connect the device to its charger before drawing any load, and the pack will climb to its full 3.85V nominal range.

Device not accepting the pack after swap

Some compact devices run a voltage-range check or a basic BMS handshake at power-on before accepting a new pack. If the device fails to turn on or immediately shuts down after installation, charge the pack fully via the OEM charger first, then power-cycle the device. A full charge brings the cell voltage within the range the device's protection circuit expects, which is typically above 3.80V, and clears most rejection faults on the first retry.

Replaces Part Numbers

1ICP4/23/27

Technical Specifications

Voltage3.85V
Amp Hours240mAh
Capacity240mAh
Rate0.92Wh
Net Weight6g /0.21 oz
Gross Weight31g /1.09 oz
Approximate Weight31g /1.09 oz
Dimension 27.60 x 23.00 x 4.00mm

Product Highlights

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

Frequently Asked Questions

My device powers on for a second then shuts straight back off after fitting this battery — what's happening?

The device is hitting an under-voltage cutoff because the pack arrived at storage voltage, not full charge. The protection circuit reads the cell below its minimum acceptance threshold and kills power immediately. Plug the device into its charger before attempting to power it on. Once the pack reaches above 3.80V, the shutdown loop clears.

The battery gets slightly warm during the first charge after swapping — is that a fault?

Warmth during the first charge is normal for a fresh Li-Polymer cell going through its initial conditioning cycle. The charge IC may apply a trickle or pre-charge phase to a cell coming in from storage voltage, which generates mild heat. If the pack becomes hot to the touch or the device smells unusual, disconnect immediately. Gentle warmth that fades once the pack reaches full charge is expected behaviour and clears after the first cycle completes.

The capacity indicator still shows incorrect readings after the swap — how do I fix it?

The fuel gauge IC calibrates against the cell it last measured, so a new pack will produce inaccurate readings until it learns the new capacity curve. Run one complete charge from flat to full without interrupting the cycle. That single uninterrupted cycle forces the gauge to recalculate its endpoint voltages against the replacement cell, and the percentage display should track accurately from the second cycle onward.

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