About this replacement
BLU R1 HD / Studio Touch — 3.8V Li-Polymer Replacement Battery (TLJ1605)
This 3.8V, 2300mAh Li-Polymer cell replaces the original battery in the BLU R1 HD, R0030UU, Studio Touch, and S0210UU smartphones. It fits directly behind the rear cover with no modification. Rated at 8.74Wh and sourced to OEM part numbers TLJ1605, TLJ16G20, and C675940250T.
- R1 HD and Studio Touch platform fit: Both the R1 HD (R0030UU) and Studio Touch (S0210UU) run the same battery bay dimensions — 69.30 × 59.70 × 3.80mm — with identical connector pinout and BMS handshake voltage. One cell covers the full pair.
- Bench tested on actual hardware: We cycled this cell on an R1 HD unit and confirmed BMS communication, charge acceptance from 0% to full, and clean cutoff at 4.35V. No thermal events. Charge IC negotiation completed normally on the second cycle.
- Fuel gauge recalibration on first use: After fitting this cell, disable fast charging for one complete discharge-charge cycle. The phone's fuel gauge IC is calibrated to the old cell's discharge curve — running one slow cycle lets it map the new cell before high-current charging begins.
Why the R1 HD reports wrong battery percentage after a cell swap
The R1 HD uses a coulomb counter that tracks charge relative to the previous cell's capacity curve. When you swap in a new cell, that baseline is gone. The IC keeps reporting against old data until it completes at least one full cycle from near-zero to full. Until that cycle finishes, displayed percentage can read 10–15% higher or lower than actual charge state. Run one full drain-to-charge cycle and the gauge resets to the new cell's curve.
Sudden shutdown at 20–25% on the replacement cell
This happens when the fuel gauge IC has not recalibrated and the phone hits a voltage cliff — the cell drops below the load threshold of the modem or display before the reported percentage reaches zero. The BMS cuts output to protect the cell, but the OS reads it as a crash. Charge the phone to 100% without interruption, then let it discharge fully in one session. After that cycle, the cutoff point aligns with the actual cell voltage floor near 3.4V.