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ZTE U288 Replacement Battery Li3710T42P3h623846 3.7V 1200mAh

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From $23.99 USD $29.99
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Fits ZTE U288 and S207 smartphones; replaces OEM part Li3710T42P3h623846.
3.7V, 1200mAh lithium-ion cell powers the phone's modem, display, and processor load.
Connector slides onto the internal contact pad; locking tab seats flush against the phone frame.
Bench testing showed the BMS accepted a full charge cycle with stable voltage ramp; fuel gauge IC required one complete discharge to sync with the new cell discharge curve.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the coulomb counter recalibrates against this cell's discharge curve before high-current charging resumes.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

1200mAh

ZTE U288 / S207 — 3.7V Li-ion Replacement Battery (Li3710T42P3h623846)

This is a 3.7V, 1200mAh Li-ion cell built to the OEM spec for the ZTE U288 and S207 smartphones. It fits the original battery slot with matching connector and dimensions (62.64 × 38.02 × 4.82 mm). Voltage and capacity match the Li3710T42P3h623846 part number exactly.

  • U288 and S207 compatibility: Both models run on the same 3.7V single-cell platform and use the same connector pinout and BMS handshake protocol. One cell covers both devices without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the U288 platform. The BMS accepted the cell without triggering a fault, and the charge IC completed a full CC/CV cycle to 4.2V.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the U288 reports wrong battery percentage after a cell swap

The fuel gauge IC on the U288 uses a coulomb counter that was trained on the original cell's discharge curve. When a new cell goes in, the stored curve no longer matches actual cell voltage under load. The phone reads a stale lookup table and reports whatever percentage the old curve predicted at that voltage. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the counter and lets the IC build a fresh curve for the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under modem activity or screen-on load, current draw spikes and the cell voltage drops sharply — faster than the fuel gauge predicted. The phone's hardware protection circuit sees the voltage dip and cuts power before the reported percentage reaches zero. After completing the first full calibration cycle described above, the fuel gauge IC learns the new cell's actual voltage sag profile and the early shutdowns stop. If they persist after two full cycles, check that the connector is fully seated — a loose pin raises contact resistance and worsens the sag.

Compatible Models

U288 S207

Replaces Part Numbers

Li3710T42P3h623846

Technical Specifications

Voltage3.7V
Amp Hours1200mAh
Capacity1200mAh
Rate4.44Wh
Net Weight25g /0.88 oz
Gross Weight50g /1.76 oz
Approximate Weight50g /1.76 oz
Dimension 62.64 x 38.02 x 4.82 mm

Product Highlights

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

Frequently Asked Questions

My ZTE U288 won't power on at all after the new battery sat in a drawer for months — is it dead?

The BMS locks out the cell when voltage drops below roughly 2.5V during storage, a hard cutoff that prevents the phone from drawing current. Plug the phone into a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC trickle-charges the cell above the BMS threshold first, then normal charging resumes. If the screen shows no charge indicator after 45 minutes, the cell has self-discharged past recovery and the BMS will not reset.

Fast charging stopped working on my U288 after I fitted the replacement battery — it only charges slowly now.

The USB-PD or proprietary fast-charge handshake between the charger and phone runs through the BMS. On the first cycle with a new cell, the BMS often defaults to a lower charge rate until it verifies the cell is within safe parameters. Run one complete slow charge to 100%, then discharge to below 20%, and reconnect the original fast charger. The BMS re-evaluates the cell on the second cycle and typically re-enables the higher current profile. If fast charging stays off after two full cycles, the issue is likely the charge IC on the phone board, not the battery.

The battery percentage on my ZTE U288 keeps jumping — it skips from 45% straight to 12% and back up.

Erratic percentage jumps mean the fuel gauge IC is still working from a lookup table calibrated to the old cell. The new cell has a different internal resistance and voltage curve, so voltage readings at any given state of charge don't match what the IC expects. Drain the phone until it shuts itself off, then charge it in one uninterrupted session to 100% without using the phone. That single full cycle gives the coulomb counter enough data to build an accurate curve and the jumping stops.

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