BLU Life Pure XL Compatible Battery 3.8V 2500mAh Li-Polymer

BLU Life Pure XL (L260L / L259L) — 3.8V Li-Polymer Replacement Battery

This 3.8V, 2500mAh Li-Polymer battery replaces the original cell in the BLU Life Pure XL smartphone, covering model numbers P0010UU, L260L, and L259L. It restores the phone's ability to hold a charge for calls, messaging, and app use. Capacity figures come from the product data — 9.5Wh at 3.8V nominal.

• Life Pure XL model fit (L260L, L259L, P0010UU): These variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — 73.81 × 54.15 × 4.34 mm cell with a matching charge-management interface, so the phone's charge IC accepts the new cell without firmware conflict.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Life Pure XL platform. The BMS engaged cutoff correctly at both ends of the voltage window, and the charge IC accepted the cell without triggering a fault state.
• First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve — skipping this step leaves the IC working off the old cell's data, causing percentage jumps or early shutdowns.

Why the Life Pure XL reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage, maps it to the old curve, and reports an incorrect percentage. One complete discharge-charge cycle — no fast charging — forces the coulomb counter to relearn the new cell's curve and restores accurate readings.

Sudden shutdown at 20–30% on the Life Pure XL

This happens when the cell voltage drops sharply under load — modem transmission or screen-on current creates a draw the cell can't sustain without hitting the BMS undervoltage cutoff. The OS percentage still shows 20–30% because the fuel gauge IC hasn't caught up to the actual voltage cliff. The fix is the same recalibration cycle: one full discharge to auto-off, then a full charge without interruption, which re-anchors the IC's low-voltage threshold to real cell behaviour. After calibration, the phone should reach a stable cutoff near 3.2–3.3V before shutdown.