As with any battery-operated product, there will be signs that the batteries need to be changed in Fingerlings. For example, if the Fingerlings are unresponsive, odds are the batteries need to be changed. If the Fingerling is slow in responding, odds are that the batteries are starting to get low. The first thing to do though is to turn the Fingerling off, then turn it back on. There is always a chance that the Fingerling just needs a little reboot, kind of like a computer. But if this doesn’t work then it is time to change the batteries.