About this replacement
BLU VIVO 4.3 / D910A — 3.7V Li-ion Replacement Battery (C594604160T)
This is a 3.7V, 1750mAh Li-ion cell replacing part number C594604160T in the BLU VIVO 4.3 and D910A smartphones. It slots into the same battery bay and connects to the same three-pin flex connector as the factory cell. Capacity is 1750mAh (6.48Wh) — matching the original specification.
- VIVO 4.3 and D910A fitment: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The cell measures 59.07 × 45.90 × 5.25mm — dimensional accuracy matters here because an oversized cell will flex the rear cover and stress the connector.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a VIVO 4.3 unit. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected under a simulated short-load event.
- Fuel gauge recalibration after install: After fitting a new cell, run one complete discharge to automatic shutdown and then a full uninterrupted charge before normal use. The VIVO 4.3 fuel gauge IC uses the old cell's learned discharge curve until it completes a fresh calibration cycle — skipping this step causes the OS to misread state of charge from day one.
Sudden shutdown at 20–30% on the VIVO 4.3 after a cell swap
This is a voltage-cliff failure, not a capacity problem. The VIVO 4.3 modem and display together can pull enough current to cause the cell voltage to sag below the BMS cutoff threshold — even when the fuel gauge still reads 20–30%. It happens most often on a new cell because the fuel gauge IC is still calibrated to the old cell's internal resistance profile. Once you complete a full discharge-to-shutdown and uninterrupted recharge cycle, the IC recalculates the discharge curve against the new cell and the phantom shutdowns stop. If they continue after two full cycles, check that the connector tab is fully seated — a loose pin adds resistance and amplifies voltage sag under load.
Phone shows erratic or jumping percentage after replacement
The BLU VIVO 4.3 uses a coulomb counter-based fuel gauge that tracks charge in and out relative to a stored discharge curve. When you install a new cell, that stored curve no longer matches the new cell's characteristics, so the reported percentage jumps as the IC tries to reconcile live voltage readings against stale reference data. The fix is one deliberate full cycle: discharge the phone until it shuts itself off, then charge uninterrupted to 100% with the screen off. After that cycle the IC locks onto the new cell's curve and percentage reporting stabilises to within a few points of actual state of charge.