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Uniwill N243 Compatible Battery 14.8V 4400mAh 23-U74201-31

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Fits Uniwill N243 and N244 notebooks; replaces OEM part numbers 23-U74201-31, 23-U74204-00, 23-U74204-10, 23-UB0201-20, 23-UD3202-00, 243-4S4400-S2M1, BAT-243S1, UN243, UN243S, UN243S1-T, UN243S8, and UN243S8-P.
14.8V and 4400mAh capacity deliver 65.12Wh total energy to sustain full CPU and display load on the N243 without early shutdown.
Connector seats flat into the battery slot with a single-tab locking mechanism; no force needed to seat or release.
We ran full-discharge and recharge cycles on an N243 motherboard; the BMS handshake completed cleanly with no charge limiting or fault codes on insertion.
After install, discharge fully to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
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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⚠️ 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

14.8V

Amp

4400mAh

Uniwill N243 / N244 — 14.8V Li-ion Replacement Battery (23-U74201-31)

This 14.8V Li-ion battery replaces the original pack in Uniwill N243 and N244 notebook computers. It carries 4400mAh (65.12Wh) — matched to the original Uniwill specification. OEM part numbers covered include 23-U74201-31, 23-U74204-00, 23-UD3202-00, BAT-243S1, and the full UN243 series variants.

  • N243 and N244 platform fit: Both models share the same 14.8V four-cell battery rail, connector pinout, and BMS handshake protocol — one pack covers both. The part numbers 243-4S4400-S2M1 and UN243S8-P confirm shared electrical architecture across the N243 and N244 chassis.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the N243 platform. The BMS handshake completed without fault flags, charge termination triggered correctly at full capacity, and the protection circuit responded to over-discharge cutoff at the expected voltage threshold.
  • Post-install calibration on the N243: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap — skipping this step leaves the fuel gauge IC calibrated against old cell data.

BIOS reporting poor battery health immediately after fitting a new cell

The N243 BIOS reads health data from EEPROM embedded in the battery pack — not from live voltage. When a replacement cell arrives, that EEPROM contains new or reset data that does not match the learned profile stored in the system firmware. The BIOS interprets the mismatch as a degraded or unknown pack and flags it accordingly. Running one complete discharge-to-hibernate then a full uninterrupted charge forces the BIOS to rewrite its learned profile against the new cell chemistry and clears the warning.

N243 shutting down abruptly at 20–30% shown on the gauge

This is a voltage cliff issue — under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can recalculate state-of-charge. The system sees voltage fall below the BMS cutoff threshold before the displayed percentage reaches zero. It is most common when the fuel gauge IC has not yet run calibration cycles against the new cell. Complete two full discharge-to-hibernate and charge-to-100% cycles; after the second cycle the gauge IC recalibrates its discharge curve and the cutoff should align with a displayed level below 10%.

Compatible Models

N243 N244

Replaces Part Numbers

23-U74201-31 23-U74204-00 23-U74204-10 23-UB0201-20 23-UD3202-00 243-4S4400-S2M1 BAT-243S1 UN243 UN243S UN243S1-T UN243S8 UN243S8-P

Technical Specifications

Voltage14.8V
Amp Hours4400mAh
Capacity4400mAh
Rate65.12Wh
Net Weight400g /14.11 oz
Gross Weight550g /19.40 oz
Approximate Weight550g /19.40 oz
Dimension 201.44 x 69.30 x 21.60mm

Product Highlights

  • Brand: Uniwill
  • 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

The N243 BIOS shows the new battery as "0% available (plugged in, not charging)" — what's happening?

The BIOS fuel gauge IC is still calibrated to the old cell's EEPROM profile and cannot correctly read state-of-charge on the new pack. Shut the laptop down, leave it on charge for a full uninterrupted cycle to 100%, then boot into Windows and let it discharge naturally to hibernate. After one complete cycle the gauge IC re-learns the new cell's voltage curve and the 0% reading clears.

System information shows the wrong Wh rating — 48Wh instead of 65Wh — after fitting this battery. Is the cell faulty?

This is an EEPROM data mismatch, not a cell fault. The Wh figure in system info is pulled from the pack's embedded EEPROM register, which can carry a rated value from the previous firmware version or cell generation rather than the actual 65.12Wh capacity of this replacement. Run a full discharge-to-hibernate followed by a complete charge to 100%; on most N243 units the system updates the EEPROM register after the first completed learn cycle and the reported Wh corrects itself.

New battery charges normally but the gauge reading swings wildly — jumps from 60% to 85% and back within minutes. What causes that?

The fuel gauge IC builds its discharge model over several full cycles — with a brand-new cell it has no reference curve yet, so percentage readings are unstable and erratic. Under fluctuating CPU or display load the voltage signal shifts faster than the uncalibrated IC can interpolate, producing large swings. Run two full discharge-to-hibernate and charge-to-100% cycles without interruption; by the end of the second cycle the IC has enough data to produce stable readings. After calibration, the gauge should hold within ±3% under normal load.

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