Anbernic Pocket RG28XX Replacement Battery 3.7V 2700mAh
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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Anbernic Pocket RG28XX Replacement Battery 3.7V 2700mAh - 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 Pocket RG28XX Replacement Battery 3.7V 2700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
2700mAh
Anbernic Pocket RG28XX — 3.7V Li-Polymer Replacement Battery (FL 704370)
This 3.7V 2700mAh Li-Polymer cell replaces the original FL 704370 battery in the Anbernic Pocket RG28XX handheld gaming console. It fits the compact form factor of the RG28XX chassis at 71.00 × 43.85 × 6.60mm. Install it when the original cell no longer holds a charge or the console shuts down earlier than expected during play.
- RG28XX fit and connector: The Pocket RG28XX uses a single-cell Li-Polymer pack with a JST-style connector tied to the onboard charge IC. This cell matches that voltage rail and connector pinout so the charge circuit can regulate properly.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the RG28XX board. The charge IC accepted the cell without fault flags, and the BMS cutoff triggered cleanly at the low-voltage threshold without hard crashing the console.
- First-cycle fuel gauge reset: After fitting this battery, run one full play session to automatic cutoff before recharging. The RG28XX fuel gauge IC sets its empty reference point against the first full discharge, so skipping this step causes the battery indicator to read inaccurately from day one.
Why the RG28XX fuel gauge jumps or reads wrong after a cell swap
The RG28XX uses a coulomb-counting fuel gauge IC that builds its capacity model from the cell's discharge curve over time. A new cell has a different internal resistance profile than the worn cell it replaces, so the stored model is immediately out of sync. This causes the percentage display to jump, stall, or drop suddenly — especially in the lower 20% of charge. The gauge self-corrects after three to five full charge and discharge cycles as it relearns the new cell's curve.
Console shuts down at 15–20% battery indicator instead of near zero
This happens when the fuel gauge's empty threshold was calibrated against a degraded cell with high internal resistance. The new cell's voltage under load stays higher for longer, but the gauge still triggers cutoff at the old voltage reference. Run the console to full automatic shutdown, then charge it to 100% without interruption. Repeat this two more times and the cutoff point will shift back toward the correct 3.0–3.2V low-voltage boundary.
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 RG28XX shows a full battery right after I installed the new cell, then drops to 50% within minutes of playing — what's happening?
The fuel gauge IC is reading a stored discharge model that doesn't match the new cell's chemistry profile. Because the cell is fresh, its open-circuit voltage sits near the top of the scale, which tricks the gauge into showing full. As current draw starts and voltage sags slightly under load, the gauge recalculates and jumps down. Run three complete discharge-to-cutoff and full-recharge cycles and the gauge will track accurately.
The RG28XX battery indicator still shows around 20% when the console suddenly cuts out — is the new battery faulty?
The cutoff is almost certainly the charge IC protecting the cell, not a fault with the cell itself. The RG28XX's low-voltage protection trips when cell voltage drops to around 3.0–3.2V under load, and a new cell that hasn't been cycled yet can reach that point while the uncalibrated fuel gauge still shows charge remaining. Charge the console to 100%, let it run to automatic shutdown, then repeat twice more. After those cycles the shutdown point and the gauge reading will align.
New battery installed but the RG28XX is only charging very slowly — is the charge IC limiting it?
Yes — the onboard charge IC on the RG28XX applies a conservative current limit when it first sees an unrecognised cell, as a safety measure. This is normal behaviour and not a fault with the battery or the board. The charge rate returns to normal after the IC completes one full charge cycle and confirms the cell voltage is responding within expected parameters. Charge the console from near-empty to 100% uninterrupted once, and the rate will normalise.
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