These 100mAh batteries are the perfect size, weight and shape for the Estes Proto X, Syncro, and Hubsan Q4 nano quadcopter. They also feature the right connector to make them plug-and-play compatible with the Proto X - that's right, despite what they say about the Proto X's battery not being replaceable, our battery is designed to plug directly into the quad's main board - no soldering or adapters required. Also, the canopy will fit the same way it does with your stock battery! These batteries also feature built-in overcharge and overdischarge protection circuits to keep them in optimum condition flight after flight.

Charge up to 6 of these batteries at the same time using our Paraboard for Blade mCP X and mCX/mSR Lipos (the Proto X & Hubsan Q4 utilize the same connector as the Blade mCX/mCX2/Nano CPX and several other Blade/Parkzone aircraft).

Compatible With:

• Estes Proto X
• Syncro
• Hubsan Q4

Dimensions (each battery):

• Length: 20mm (0.79 in.)
• Width: 14mm (0.55 in.)
• Height: 6mm (0.24 in.)
• Weight: 2g (0.07 oz)