About this replacement
ZTE Blade V7 Series — 3.8V Li-Polymer Replacement Battery (Li3825T43P3h736037)
This is a 3.8V, 2500mAh Li-Polymer cell replacing OEM part Li3825T43P3h736037 in the ZTE V7 and Blade V7 range. It fits the V7, Blade V7, V7 Lite, and V7 Lite Dual SIM variants. Capacity is 9.5Wh — matched to the original specification.
- Blade V7 family compatibility: The V7, Blade V7, V7 Lite, and V7 Lite Dual SIM all share the same battery bay dimensions and connector pinout. The BMS handshake protocol is identical across these variants, so the same cell works across the lineup without firmware or connector modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Blade V7 unit. The BMS accepted the cell on first contact, charge termination triggered correctly at 4.35V, and the protection circuit tripped as expected under over-discharge conditions.
- Fuel gauge recalibration on first cycle: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the coulomb counter IC one clean reference cycle against the new cell's actual discharge curve before fast-charge current is applied to an uncalibrated cell.
Why the Blade V7 reports wrong battery percentage after a cell swap
The ZTE Blade V7 uses a coulomb counter IC that builds its fuel gauge model from the cell's discharge curve over time. When a new cell goes in, the IC still holds the curve data from the old, degraded cell. The mismatch means the reported percentage can jump or read low while the actual cell voltage is healthy. One full discharge-to-shutdown followed by an uninterrupted charge cycle resets the counter's reference data and aligns the display percentage with real cell state.
Sudden shutdown at 20–30% on the Blade V7 after replacement
This is a voltage cliff issue, not a capacity fault. Under peak load — modem transmit bursts or high screen brightness — the cell must sustain voltage above the BMS cutoff threshold. If the fuel gauge IC is still calibrated to the old cell's curve, it will report 20–30% remaining at the exact moment real cell voltage drops below the cutoff under load. The phone cuts out even though the percentage display looks fine. Run one full calibration cycle first; if shutdowns continue, check that the cell connector is fully seated and re-check voltage at the contacts — it should read at least 3.7V at rest.