About this replacement
Anbernic RG556 — 3.8V Li-Polymer Replacement Battery (FL806475)
This 3.8V, 5400mAh Li-Polymer cell replaces the original FL806475 battery in the Anbernic RG556 handheld gaming console. It matches the OEM voltage, capacity, and connector so the existing charge circuit and fuel gauge have what they need to operate. Dimensions are 71.50 x 61.50 x 7.00mm — measure your original before fitting if the shell has been opened before.
- RG556 fitment: The RG556 uses a single-cell Li-Polymer pack with a proprietary flex connector that carries both power and fuel gauge data. This cell matches that pinout. No connector adapters or re-wiring required.
- Bench tested on actual hardware: We cycled the cell through charge and discharge on the RG556 mainboard. The onboard BMS accepted the charge handshake without fault flags, and the fuel gauge IC tracked state-of-charge through a full cycle without interruption.
- First-cycle fuel gauge calibration: After fitting, run one complete play session to automatic low-battery shutoff before recharging. The RG556 fuel gauge IC sets its empty reference point against the first full discharge of a new cell — skipping this step causes the percentage readout to jump or stall for several sessions.
Why the RG556 fuel gauge reads inaccurate after a cell swap
The RG556 uses a coulomb-counting fuel gauge IC that builds a discharge model over time. When a new cell goes in, the IC still holds the old cell's learned curve in memory. Until it runs a full discharge cycle on the new cell, it maps current draw against the wrong baseline. This causes the percentage indicator to jump forward or drop suddenly at certain charge levels. One complete discharge to automatic shutoff followed by a full charge resets the reference point and the gauge tracks accurately from there.
RG556 showing lower play time than expected after battery replacement
Fresh Li-Polymer cells do not deliver their full rated capacity on the first charge cycle. Internal resistance is slightly elevated out of the packaging, and the electrolyte needs several charge-discharge cycles to fully saturate the electrode surfaces. The RG556's 5400mAh rating is reached after three to five full cycles, not on day one. Charge fully, play to automatic shutoff, and repeat — capacity increases measurably with each pass until it stabilises at the rated figure.