For Version 1
The batteries will read 4.2 volts after fully charged. They should power the unit on and bring the unit up to the desired temperature. If the batteries don’t read 4.2 volts when fully charged, the batteries might be getting weaker and may need to be replaced. If the batteries show no voltage and won’t charge, they may need to be jump started (video below) with a fully charged battery showing 4.2 volts. If the batteries will turn the SideKick on but shut off when the unit starts to heat up, the batteries aren’t pushing the energy through the battery, and the battery needs to be replaced. If the unit will not turn on at all with any set of batteries and the batteries all show 4.2 volts, we may need to continue to troubleshoot to resolve the issue.