In theory, yes. I've seen some built-in systems that were great, but I haven't seen a consumer system that I was happy with yet. In all fairness, I haven't had a chance to work with the newer Sanyos, but even those will have a limit. Any rechargeable battery will eventually reach a point it can't be recharged.

But I do agree- there should be something on them about the batteries needing some TLC to be reliable.