I just bought a bunch of different EGO items which I haven't fully tested but so far am happy. I am wondering though how much I am locked into EGO when the batteries ultimately fail. I assume batteries that will work with these tools are only made by EGO and that if 3 years from now EGO has moved on to bigger and better batteries and wants to charge me 3 times as much for the old battery model that this will be my only choice (other than replacing all the tools I bought). Is that right? Is anyone else concerned about this?