Nokia Lumia 630 BL-5H Replacement Battery 3.7V 1800mAh

Nokia Lumia 630 / 635 / 636 / 638 — 3.7V Li-ion Replacement Battery (BL-5H)

This is a 3.7V, 1800mAh (6.66Wh) Li-ion replacement for the Nokia BL-5H cell. It fits the Lumia 630, 635, 636, and 638 — mid-range Windows Phone handsets that share the same removable battery bay and connector. If your original cell no longer holds a charge or swells, this is a direct swap.

• Lumia 630 / 635 / 636 / 638 compatibility: All four models run the same 3.7V battery rail and use the BL-5H form factor with an identical three-contact connector. No adapter or modification is needed across any model in this group.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Lumia 635 unit. The BMS accepted the charge without false-positive overvoltage trips, and the phone completed a full cycle without thermal flags from the charge IC.
• Fuel gauge recalibration after install: On first use after installation, run one complete discharge-to-low and charge-to-full cycle before relying on the battery percentage indicator. The Lumia fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it remap against the new cell before you trust the percentage readout.

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

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell's actual voltage drops under screen or modem load, the IC misreads remaining capacity and triggers an emergency shutdown — often at 20–30% indicated charge. The fix is not to recharge immediately. Let the phone shut down, then charge uninterrupted to 100% and discharge fully once. After that single calibration cycle, the IC recalculates cutoff voltage against the new cell and shutdowns at false percentages stop.

Phone won't power on after the BL-5H sat in storage

Li-ion cells stored discharged can drop below the BMS protection threshold — typically 2.5V per cell. When voltage falls that low, the BMS locks out to prevent damage, and the phone shows nothing when you press power. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS unlock threshold, usually around 3.0V, at which point the phone will boot normally.