About this replacement
BLU Studio 6.0 HD / D650A / D651U — 3.7V Li-Polymer Replacement Battery (G9005)
This 3.7V, 3000mAh lithium-polymer cell replaces the original battery in the BLU Studio 6.0 HD, D650A, D651U, and compatible Studio 6.0 variants. It matches the OEM connector, physical footprint (93.90 × 63.55 × 3.80mm), and BMS handshake. Capacity is rated at 11.1Wh — identical to the factory spec.
- Studio 6.0 series compatibility: The D650A, D651U, and related Studio 6.0 variants share the same battery bay dimensions, connector pinout, and charge IC voltage rail. One cell covers all of them without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Studio 6.0 HD platform. The BMS accepted the full charge curve without cutoff errors, and the fuel gauge IC registered correct state-of-charge readings after one complete cycle.
- First-cycle calibration on the Studio 6.0 HD: After installation, disable fast charging for the first full discharge-charge cycle. The fuel gauge IC was calibrated to the old cell's discharge curve. One full cycle at standard current lets it recalibrate against the new cell before high-current charging begins.
Sudden shutdown at 20–30% on the Studio 6.0 HD after cell replacement
The Studio 6.0 HD's modem and 6-inch display draw high instantaneous current. When the fuel gauge IC has not yet mapped the new cell's discharge curve, it misreads remaining charge. The phone shuts down when the cell voltage drops below a safe threshold — even though the reported percentage still looks healthy. One complete discharge down to automatic shutdown, followed by a full charge to 100%, forces the coulomb counter to reset against the new cell's actual capacity.
Phone not powering on after the replacement battery sat in storage
Li-polymer cells self-discharge in storage. If the replacement cell dropped below approximately 2.5V per cell before installation, the BMS enters a lockout state and the phone will not respond to a normal charger. Connect the phone to a wall charger — not a PC USB port — and leave it undisturbed for 20–30 minutes without pressing the power button. The charge IC delivers a low-current trickle to bring the cell above the BMS recovery threshold, typically around 3.0V, at which point the phone will power on normally.