Tecno HD61 Album 3.7V Replacement Battery 1000mAh Li-ion

Tecno HD61 Album — 3.7V Li-ion 1000mAh Replacement Battery

This is a 3.7V, 1000mAh lithium-ion cell for the Tecno HD61 Album smartphone. It replaces a worn or failed original battery when the phone no longer holds a charge or shuts down unexpectedly. Voltage and capacity match the stock specification for this handset.

• HD61 Album compatibility: The HD61 Album uses a compact 53.00 × 33.90 × 5.70mm cell at 3.7V. This replacement matches those physical and electrical parameters exactly — the BMS handshake and connector orientation carry over from the original cell without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS triggers charge cutoff at the correct upper voltage threshold and that protection circuitry responds normally to load. No anomalous heat or voltage deviation was recorded during the test run.
• First cycle after installation: On first use, disable fast charging if your charger supports it, then run one full discharge-charge cycle at standard rate. 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 HD61 Album after a cell swap

The HD61 Album's fuel gauge IC holds a learned discharge curve from the old cell. When a new cell goes in, the IC's stored curve no longer reflects real voltage behaviour, so the phone cuts power at what it thinks is a safe floor — often 20–30% displayed charge. The new cell's actual voltage drops below the modem or screen load threshold before the IC expects it to. One full discharge-charge cycle at standard rate forces the coulomb counter to recalibrate against the replacement cell's actual characteristics. After that cycle, shutdown percentages normalise.

Phone warm near the battery compartment during the first charge

A new lithium-ion cell typically has higher internal impedance than a broken-in cell. The charge IC compensates by pushing slightly more voltage early in the charge cycle, which generates more heat at the cell surface. On the HD61 Album this shows up as noticeable warmth around the back cover during the first one or two charges. It settles as the cell conditions. If the back cover becomes hot to the touch — not just warm — disconnect the charger and allow the phone to cool to room temperature before resuming.