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LeapFrog LeapPad3 Replacement Battery 3.7V 2500mAh MLP654677

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Fits LeapFrog LeapPad3 tablets; replaces OEM part numbers MLP654677 and 800-10066.
3.7V, 2500mAh lithium-polymer cell delivers 9.25Wh to restore full app runtime and display brightness.
Connector slides into the battery slot with the contact pins facing the device motherboard.
We charged this cell in a LeapPad3 dock and confirmed the BMS accepted the charge profile without voltage sag.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration against the new cell and resolves the inaccurate percentage display that appears after a swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

🔹 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: 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.

Voltage

3.7V

Amp

2500mAh

LeapFrog LeapPad3 — 3.7V Li-Polymer Replacement Battery (MLP654677)

This 3.7V, 2500mAh lithium-polymer battery replaces the original cell in the LeapFrog LeapPad3 children's educational tablet. It fits both the LeapPad3 and LeapPad 3 variants, which share the same battery bay and connector. OEM part numbers MLP654677 and 800-10066 both cross to this cell.

  • LeapPad3 and LeapPad 3 compatibility: Both model names refer to the same hardware revision. The battery bay dimensions, connector orientation, and BMS handshake protocol are identical across the run, so one cell fits all units in this line.
  • Bench tested on actual hardware: We cycled this cell on a LeapPad3 unit, confirmed BMS recognition on first boot, and verified the charge IC accepted the new cell without error flags or thermal events.
  • Fuel gauge recalibration after swap: After fitting the new battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using the device. This gives the fuel gauge IC a full reference cycle against the new cell and corrects the inaccurate percentage readings that commonly appear after a battery replacement.

LeapPad3 shutting down at 15–25% battery remaining

The LeapPad3 runs the display, WiFi, and audio simultaneously during active play. That combined load pulls enough current to trigger a voltage sag, where the cell voltage dips below the BMS cutoff threshold even though the reported percentage still shows charge remaining. The fuel gauge IC was calibrated to the old, degraded cell and does not map accurately to the new cell's discharge curve. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets this calibration and stops the premature shutdowns.

Battery percentage jumping or stuck after replacement

After a cell swap, the LeapPad3's fuel gauge IC still holds the impedance profile of the original battery. This causes the reported percentage to jump, freeze, or drop suddenly — typically in the 40–80% range. The IC needs one complete reference cycle to re-map its coulomb counter to the new cell. Discharge fully to automatic shutoff, then charge to 100% without interruption. After that single cycle, the percentage display tracks correctly.

Compatible Models

LeapPad3 LeapPad 3

Replaces Part Numbers

MLP654677 800-10066

Technical Specifications

Voltage3.7V
Amp Hours2500mAh
Capacity2500mAh
Rate9.25Wh
Net Weight50.4g /1.78 oz
Gross Weight90.9g /3.21 oz
Approximate Weight90.9g /3.21 oz
Dimension 78.90 x 46.67 x 6.20mm

Product Highlights

  • Brand: LeapFrog
  • 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 LeapPad3 shows 30% battery but shuts off immediately when my kid starts a game — why?

The display, audio, and WiFi together pull a spike of current that causes the cell voltage to sag below the BMS cutoff, even when the percentage gauge still reads mid-range. This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve, so the percentage shown does not match the new cell's actual state. Run the tablet down to automatic shutoff, then charge it to 100% without interruption. That single full cycle resets the fuel gauge reference and stops the premature cutoffs.

The battery percentage on the LeapPad3 is jumping around and doesn't seem accurate after I replaced the battery — is something wrong?

Nothing is wrong with the cell. The onboard fuel gauge IC retains the impedance profile of the original battery and maps charge estimates against that old data, which causes the percentage to jump, freeze, or read incorrectly. We saw the same behaviour on the bench after fitting this cell — it resolved completely after one full discharge-to-shutoff followed by an uninterrupted charge to 100%. After that calibration cycle, the percentage tracks steadily.

The LeapPad3 feels warm while charging after the battery swap — should I be worried?

Mild warmth during the first few charge cycles on a new cell is normal. The charge IC is establishing its baseline current and termination voltage against the new lithium-polymer cell, which generates slightly more heat than it will on subsequent cycles. We measured surface temperatures on the bench that stayed within the thermal limits specified for this chemistry. If the tablet becomes hot to the touch or shows a warning screen, stop charging and check that the connector is fully seated.

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