Anbernic RG505 Compatible Battery FL606090 3.7V 5000mAh
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Anbernic RG505 Compatible Battery FL606090 3.7V 5000mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Anbernic RG505 Compatible Battery FL606090 3.7V 5000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
5000mAh
Anbernic RG505 — 3.7V Li-Polymer Replacement Battery (FL606090)
This is a 3.7V, 5000mAh Li-Polymer cell carrying part number FL606090. It fits the Anbernic RG505 handheld retro gaming console. It replaces a degraded or failed original cell and restores untethered play.
- RG505 fitment: The RG505 runs a single-cell Li-Polymer pack on a 3.7V nominal rail. The FL606090 cell dimensions — 92.40 × 60.00 × 6.30 mm — match the battery bay exactly. The connector pinout and BMS communication lines align with the console's charge IC without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the RG505 platform. The BMS accepted the cell without triggering overcurrent or NTC fault flags. Charge termination cut off cleanly at 4.2V as expected.
- Fuel gauge calibration on first install: After fitting this cell, run one complete play session to automatic low-battery cutoff before recharging. The RG505 fuel gauge IC sets its empty reference point against the first full discharge cycle. Skipping this step causes the percentage indicator to read high and shut down unexpectedly.
Why the RG505 fuel gauge jumps or reads incorrectly after a cell swap
The RG505 uses a coulomb-counting fuel gauge IC that tracks charge relative to a stored discharge curve. When you fit a new cell, that stored curve no longer matches the new cell's actual chemistry profile. The gauge will show erratic percentages — jumping from 80% to 30% mid-session — until it recalibrates. One full discharge to cutoff followed by a full charge resets the reference and stabilises the readout.
Console shuts down suddenly while the battery indicator still shows charge remaining
This happens when the cell voltage sags below the BMS cutoff threshold under load, even though the fuel gauge still displays a non-zero percentage. On the RG505, running demanding emulation cores pushes higher current draw, which accelerates voltage sag on a partially discharged cell. A new cell that hasn't completed conditioning cycles will sag earlier than the gauge predicts. After 3–5 full charge and discharge cycles, the cell's internal resistance drops and the voltage sag under load reduces — unexpected shutdowns typically stop after that.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Anbernic
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My RG505 battery percentage jumped from 65% to 15% and the console shut off — did I get a faulty cell?
The cell is most likely fine. The RG505 fuel gauge IC calibrates its empty reference against the original cell's discharge curve, and a new FL606090 cell has a slightly different curve. The gauge loses accuracy until it recalibrates against the new cell. Run one complete session to automatic low-battery cutoff, then charge fully to 4.2V — the percentage readout stabilises after that first full cycle.
My RG505 is only charging the new battery very slowly — the charge light stays on far longer than it did with the original cell.
The RG505 charge IC applies a reduced current limit when it first sees a new cell, particularly if the cell voltage is low on arrival. This is a one-cycle behaviour — the IC is confirming the cell responds normally before applying full charge current. Charge the console from a known-good USB-C source rated at least 5V/2A, let it complete the full charge cycle uninterrupted, and the charge rate returns to normal on the next cycle.
After fitting the replacement FL606090, my RG505 is giving noticeably shorter play sessions than the original battery used to — is the 5000mAh rating accurate?
New Li-Polymer cells don't deliver full rated capacity straight out of the packaging. Internal resistance is slightly elevated before the cell has been cycled, which reduces usable capacity during early sessions. The FL606090 is rated at 5000mAh, and we confirmed it reaches that range on the bench after conditioning. Run 3–5 complete charge and discharge cycles and play time will increase progressively toward the rated figure each time.
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