About this replacement
BLU Studio 5.0C HD — 3.7V Li-ion Replacement Battery (C706043200L)
This is a 3.7V, 2000mAh Li-ion cell for the BLU Studio 5.0C HD and related Studio series smartphones. It fits the Studio 5.0 II, Studio 5.0C Mini, and D534, among others sharing the same battery bay and connector. OEM part numbers C706043200L and C706043200T both apply to this fit group.
- Studio series battery compatibility: These models share a common PCB connector, cell footprint (70.00 × 59.90 × 4.40mm), and a 3.7V nominal rail. The BMS handshake is identical across the group, so one cell covers all listed devices without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on a Studio 5.0C HD unit. The BMS held charge current stable through the CC/CV transition, and protection cutoffs triggered correctly at both ends of the voltage range.
- Fuel gauge recalibration after install: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it starts reporting percentages. Skipping this step causes erratic percentage readings in the first few days.
Sudden shutdown at 20–30% on the BLU Studio after a cell swap
This happens because the fuel gauge IC is still using the discharge curve it mapped for the old, degraded cell. The new cell has a steeper voltage drop under modem and screen load near the bottom of its range — the fuel gauge doesn't see it coming. The phone cuts out before the percentage reaches zero. One full discharge-charge cycle with mobile data and screen brightness at normal levels forces the coulomb counter to recalibrate against actual cell behaviour. After that cycle, shutdowns at 20–30% stop.
BLU Studio not powering on after sitting in storage
If the phone has been stored with a flat or near-flat battery for weeks, the cell voltage can drop below 2.5V. At that point, the BMS enters lockout and blocks charging current entirely — the phone shows nothing when plugged in. Connect the phone to a low-current charger (5W, not fast charge) and leave it for 20–30 minutes before pressing the power button. The BMS needs a trickle input to exit lockout and allow the charge IC to begin normal charging. If the phone still shows no response after that window, check that the charger output is confirmed at 5V before replacing the cable.