Mad Dog 4000 mAh Transmitter Pack, Spectrum DX7s and DX8

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The 4000 2S Lipoly battery offers double the flight time as the stock DX8 or DX7s battery. This is a Li-Poly battery and must be charged with a Li-Poly charger. This battery will fit in your DX7s or DX8 with no modification and will enable you to fly for months without charging. No modification to your radio or the lipoly battery are required.