Use a voltage divider. Use two 100KOhm resistors to divide the battery's voltage by 2, and then the maximal voltage at the IOIO pin will not exceed 3.6V. For some reason I cannot upload a sketch I've made, so check this link - http://en.wikipedia.org/wiki/Voltage_divider Connect Vin to the battery and Vout to the IOIO
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