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Lego Ninjago Movie Edition WiFi Tablet Compatible Battery 3.8V 3600mAh

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Fits Lego Ninjago Movie Edition WiFi tablet, restores original 3.8V 3600mAh capacity.
3.8V 3600mAh lithium-polymer cell delivers full display and WiFi runtime on charge.
Connector slides into original battery slot with no modification or adapter needed.
We bench-tested this cell in the Ninjago tablet; BMS accepted charge without fault codes.
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.
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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.

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⚠️ 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

3.8V

Amp

3600mAh

Lego Ninjago Movie Edition WiFi — 3.8V Li-Polymer Replacement Battery

This 3.8V, 3600mAh Li-Polymer battery is a direct replacement for the Lego Ninjago Movie Edition WiFi tablet. It powers the display, processor, and wireless connectivity. Capacity is rated at 13.68Wh as supplied.

  • Ninjago Movie Edition WiFi tablet fit: This battery matches the voltage rail and physical footprint of the Ninjago Movie Edition WiFi. At 103.00 x 80.00 x 3.40mm, it seats correctly in the battery bay without modification. The BMS communicates with the charge IC as the original cell does.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the Ninjago Movie Edition WiFi platform. The BMS accepted charge input without triggering a protection cutoff, and the tablet's charge IC recognised the cell correctly across the full voltage range from 3.0V to 4.35V.
  • Fuel gauge recalibration after swap: 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 reading that commonly appears after a battery swap.

Tablet shutting down at 15–25% remaining after battery replacement

When display brightness is high and WiFi is active simultaneously, the combined current draw creates a voltage sag the fuel gauge reads as critically low. The tablet's protection circuit interprets this as a near-empty cell and initiates shutdown, even though capacity remains. This happens most often on Li-Polymer cells that haven't completed a calibration cycle. Run one full discharge to auto-shutoff and recharge to 100% — the fuel gauge IC relearns the cell's actual voltage-to-capacity curve and the early shutdowns stop.

Fast charging not available after battery swap on the Ninjago WiFi tablet

The charge IC on this tablet negotiates the charging rate after it confirms the connected cell is stable and within accepted parameters. On a fresh replacement cell, that negotiation may default to standard rate until one full charge cycle completes. Use the original charging cable and adapter — third-party accessories can prevent the handshake entirely. After one accepted full cycle, fast charge availability typically restores automatically.

Compatible Models

Ninjago Movie Edition WiFi

Technical Specifications

Voltage3.8V
Amp Hours3600mAh
Capacity3600mAh
Rate13.68Wh
Net Weight60g /2.12 oz
Gross Weight95g /3.35 oz
Approximate Weight95g /3.35 oz
Dimension 103.00 x 80.00 x 3.40mm

Product Highlights

  • Brand: Lego
  • 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 Lego Ninjago WiFi tablet shows 80% battery but shuts off immediately under load — what's happening?

The fuel gauge IC is calibrated to the old, degraded cell and doesn't match the new battery's voltage curve. Under combined display and WiFi load, voltage sags just enough to trigger the low-voltage protection cutoff. Run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using it. That single full cycle recalibrates the fuel gauge and the premature shutdowns stop.

The battery percentage on my Ninjago tablet is jumping around and dropping way faster than it should from a full charge — is the battery faulty?

It's not a faulty cell — it's fuel gauge drift. The tablet's gauge IC is still using the capacity model from the old battery, so percentage readings are unreliable from the start. Charge the tablet to 100%, use it normally until it shuts off automatically, then charge back to 100% in one uninterrupted session. After that recalibration cycle, the percentage display stabilises and tracks accurately against the 3600mAh capacity.

Fast charging stopped working after I replaced the battery on my Ninjago Movie Edition WiFi — the tablet now charges much slower than before.

The charge IC defaults to standard rate on the first cycle with a new cell while it confirms the cell is stable and within voltage limits. One full accepted charge cycle — from low to 100% uninterrupted using the original cable and adapter — restores the rate negotiation. Third-party cables that can't carry the correct handshake signal will keep the tablet locked at standard rate indefinitely, so confirm you're using the original charger before assuming the battery is the cause.

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