CECT V10 Replacement Battery 3.7V 1000mAh Li-ion

CECT V10 — 3.7V Li-ion Replacement Battery

This is a 3.7V 1000mAh Li-ion cell for the CECT V10 smartphone. It replaces the original battery when the phone no longer holds charge or fails to power on. Capacity is 3.7Wh — matched to the V10's original cell specification.

• CECT V10 fit: The V10 uses a compact removable cell rated at 3.7V nominal. This replacement matches the original cell dimensions at 53.00 x 33.90 x 5.70mm, ensuring the connector aligns and the battery seats flush in the compartment without forcing the back cover.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the bench. The BMS accepted charge normally, held voltage above 3.5V through the mid-range, and triggered the low-voltage cutoff at the expected threshold without erratic shutdowns.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to near-empty before recharging completely. The V10's fuel gauge IC was calibrated to the original cell's discharge curve — one complete cycle syncs it to the new cell so the percentage readout tracks accurately.

Sudden shutdown at 20–30% on the CECT V10 after a cell swap

This happens because the fuel gauge IC still holds the discharge map from the old, degraded cell. A new cell has a steeper voltage-to-capacity curve in the lower range. When the phone draws current for a call or screen-on event, voltage sags below the shutdown threshold before the gauge has counted down to zero. The phone cuts out even though charge appears to remain. One full discharge-charge cycle rewrites the coulomb counter reference and clears the mismatch.

CECT V10 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge over time. If this battery was stored discharged, the BMS may have entered lockout mode to prevent damage — this happens when cell voltage drops below approximately 2.5V. The phone will show no response to the power button. Connect the phone to a charger and leave it for 15–20 minutes without pressing anything; the charge IC trickle-charges the cell back above the BMS recovery threshold, after which normal charging resumes. If the phone still shows no sign of life after 30 minutes on charge, verify the charger output is a stable 5V.