OnexPlayer 1S Compatible Battery 11.1V 4400mAh AEC627138
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OnexPlayer 1S Compatible Battery 11.1V 4400mAh AEC627138 - 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.
OnexPlayer 1S Compatible Battery 11.1V 4400mAh AEC627138 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
OnexPlayer 1S Game Player — 11.1V Li-Polymer Replacement Battery (AEC627138)
This 11.1V, 4400mAh lithium-polymer cell is a direct replacement for the OnexPlayer 1S handheld gaming PC. It fits the 1S Game Player chassis and matches the OEM part numbers AEC627138 and HD627138. Voltage, capacity, and connector are matched to the original specification.
- OnexPlayer 1S platform fit: The 1S uses an 11.1V three-cell Li-Polymer pack with a dedicated BMS that monitors cell balance and communicates state-of-charge to the Windows fuel gauge. This replacement cell meets that voltage rail and BMS handshake requirement without modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the 1S platform. The BMS accepted the cell without fault codes, balanced across all three cells within the first full cycle, and the Windows battery indicator tracked correctly by cycle two.
- First-cycle fuel gauge calibration: After installing this battery, run one complete play session to automatic system cutoff before plugging in. The 1S fuel gauge IC sets its empty reference point against the first full discharge cycle — skipping this step causes the percentage readout to jump or cut off early in subsequent sessions.
Why the OnexPlayer 1S fuel gauge reads inaccurately after a cell swap
The 1S uses a coulomb-counting fuel gauge IC that builds its discharge model from the first complete cycle on each new cell. When you swap cells, the IC still holds the old cell's discharge curve in memory. Until it recalibrates, reported percentages can jump, stall, or trigger a low-battery shutdown well above the true empty threshold. Running one full discharge to automatic cutoff, then charging uninterrupted to 100%, resets the reference curve. After that cycle, the gauge tracks the new cell accurately.
OnexPlayer 1S shutting down suddenly while the battery still shows charge remaining
This is a voltage sag issue, not a capacity issue. Under high GPU and CPU load, the 1S draws peak current that can pull cell voltage below the BMS cutoff threshold before the fuel gauge has time to update — the screen goes dark while Windows still reported 15–20% remaining. A new cell in its first few cycles has slightly higher internal resistance, which makes this sag more pronounced. After three to five full conditioning cycles, internal resistance drops and the sag narrows. If shutdowns persist past five cycles, check that the battery connector is fully seated — a partial connection increases resistance at the joint and worsens the sag.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: OnexPlayer
- 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 OnexPlayer 1S battery percentage keeps jumping around after I put in the replacement — is the new cell faulty?
The cell is almost certainly fine. The 1S fuel gauge IC carries the old cell's discharge curve in memory and applies it to the new cell until it recalibrates. Run the device from a full charge down to automatic system cutoff without interruption, then charge straight back to 100%. That single complete cycle resets the reference curve and the percentage readout stabilises from the next session onward.
The replacement battery isn't charging as fast as the original did — the 1S seems to be charging slowly.
The 1S charge IC applies a conservative current limit on cells it hasn't seen before. This is a protection behaviour, not a fault. It typically clears after one complete charge-discharge cycle as the IC builds confidence in the cell's response. Charge the device normally through one full cycle and check the rate again — it should return to the standard charge rate by the second cycle.
My OnexPlayer 1S is still cutting off earlier than expected even after a few cycles with the new battery.
After three to five full cycles, early cutoffs usually point to a connector seating issue rather than cell capacity. A partially seated battery connector adds resistance at the joint, which amplifies voltage sag under GPU load and trips the BMS cutoff before the cell is genuinely empty. Power down the device, reseat the battery connector firmly until it clicks, and confirm the retention clip is locked. Then run a full discharge cycle and check — cell voltage at cutoff should be at or near 9.0V across the pack.
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