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Coolpad 8810 Replacement Battery CPLD-65 3.7V 1350mAh

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From $28.99 USD $35.99
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Fits Coolpad 8810 smartphone; replaces OEM part CPLD-65 lithium-ion cell.
3.7V nominal voltage, 1350mAh capacity delivers 5Wh to power processor, display, and modem.
Connector is flat contact tab; slides into battery slot with locking tab seated flush.
We bench-tested this cell in the 8810 platform—BMS accepted the pack on first insertion, voltage curve held steady through discharge.
On first use after installation, run one complete discharge-charge cycle without fast charging to let the fuel gauge IC recalibrate against the new cell's discharge curve.
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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

3.7V

Amp

1350mAh

Coolpad 8810 — 3.7V Li-ion Replacement Battery (CPLD-65)

This is a 3.7V, 1350mAh Li-ion cell built to the CPLD-65 spec for the Coolpad 8810 smartphone. It replaces the original battery when capacity has dropped or the cell has failed entirely. Physical dimensions are 52.28 × 44.02 × 5.47mm — confirm clearance before installing.

  • Coolpad 8810 fit: The 8810 uses the CPLD-65 footprint exclusively — same connector pinout, same BMS handshake voltage. No adaptation required at the board level.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the 8810 platform. The BMS accepted the full charge cycle without tripping, and the charge IC held stable current throughout.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the Coolpad 8810

This is a voltage cliff issue, not a capacity problem. When the modem transmits or the screen peaks, the cell has to supply a current spike. If the cell's internal impedance is high — common on degraded originals — terminal voltage drops sharply under that load. The phone's protection circuit reads the voltage drop as a low-battery emergency and shuts down instantly. A new cell with lower impedance sustains voltage through those spikes and eliminates the cutout.

OS reporting wrong battery percentage after cell swap

The Coolpad 8810's fuel gauge IC stores a discharge curve calibrated to the old cell. After you install a new cell, the IC compares real voltage to that old curve — the mismatch produces inaccurate percentage readings and erratic jumps. The fix is one full uninterrupted discharge down to automatic shutdown, followed by a full charge to 100% with fast charging off. After that cycle, the coulomb counter resets its reference points to the new cell and percentage readings stabilise.

Compatible Models

8810

Replaces Part Numbers

CPLD-65

Technical Specifications

Voltage3.7V
Amp Hours1350mAh
Capacity1350mAh
Rate5Wh
Net Weight26g /0.92 oz
Gross Weight51g /1.80 oz
Approximate Weight51g /1.80 oz
Dimension 52.28 x 44.02 x 5.47mm

Product Highlights

  • Brand: Coolpad
  • 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 Coolpad 8810 shuts off at around 25% — does the replacement battery fix this?

Yes, and the cause is almost always voltage sag on the old cell rather than actual capacity loss. Under modem or display load, a degraded cell's terminal voltage collapses fast enough to trigger the protection circuit, which reads it as a critical low and forces shutdown. A new CPLD-65 cell holds voltage through those current spikes and removes the cliff. If shutdowns persist after installation, run one full discharge-charge cycle so the fuel gauge IC recalibrates to the new cell's curve.

The battery percentage on my 8810 is jumping around after I put in the new battery — is the replacement faulty?

It is not faulty — this is the fuel gauge IC recalibrating. The IC was calibrated to the old cell's discharge curve, and the new cell's voltage profile does not match those stored reference points yet. Discharge the phone fully until it shuts itself off, then charge uninterrupted to 100% with fast charging disabled. After that one cycle, the coulomb counter resets its baseline to the new cell and the percentage display stabilises.

The 8810 won't power on at all after the new battery sat in a drawer for months — is it dead?

The BMS locks out when cell voltage drops below approximately 2.5V during storage. The phone will not respond to the power button in this state. Connect the phone to a charger and leave it for 15–20 minutes without pressing anything — the charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold. Once voltage reaches around 3.0V, the BMS re-initialises and the phone will power on normally.

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