About this replacement
Anbernic RG 350M / RG 353M — 3.8V Li-Polymer Replacement Battery (AHB5250756)
This 3.8V 2500mAh Li-Polymer cell replaces the original AHB5250756 battery in the Anbernic RG 350M, RG 353M, and RG 350M Retro handheld consoles. It fits the original battery bay without modification and connects to the same charge management circuit. Capacity is 2500mAh (9.5Wh), matching the stock specification.
- RG 350M and RG 353M fitment: Both consoles share the AHB5250756 cell format — same 70.50 × 49.60 × 5.10mm footprint, same 3.8V nominal rail, and same two-wire connector that talks to the onboard charge IC. No adapter or wiring change needed.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the RG 350M platform. The BMS accepted the cell without error flags, and the charge IC stepped through CC/CV phases cleanly to full termination.
- Fuel gauge recalibration after swap: After installing, run one complete play session to automatic low-battery cutoff before plugging in. The RG 350M's fuel gauge IC sets its empty reference point against the first full discharge of whichever cell is installed — skipping this step causes the percentage display to read inaccurately.
Why the RG 350M fuel gauge jumps or reads wrong after a cell swap
The RG 350M uses a coulomb-counting fuel gauge IC that tracks charge going in and out of the cell. When you swap the physical cell, the IC still holds the discharge curve it built for the old battery. A new cell with different internal resistance will shift the open-circuit voltage at each state-of-charge point, so the gauge reads off — sometimes jumping 20–30% mid-session. Running one full discharge cycle lets the IC rebuild its reference table against the new cell's actual curve.
Console not charging the replacement cell at full rate
On first charge after installation, the RG 350M's charge IC may apply a reduced current limit — this is normal behaviour when the cell voltage comes in below the IC's expected resting threshold. The IC treats the cell as potentially over-discharged and enters a preconditioning phase at a fraction of the full charge rate. Once the cell voltage climbs above approximately 3.0V, the IC steps up to its standard constant-current rate. The conservative limit clears on its own; no reset is required.