RE: Voltmeter ???
It's my understanding that you shoulg get 7.2v (on a 7.2v pack) or maybe even more when fully charged. It's usually in a range of some sort. Example: 7.2-7.4 or something like that. When drained you can get something like 4.2 Just remember, the only real way to check the battery is under a load, so in your charger is a good way. (That is how I also chekc mine.) I hope this helps.
Oz[8D]