Umm, just a few battery tips:

1. Lithium batteries require special care, unlike Nicd/Nimh.
2. A lot of chargers you can get for around 30 bucks, but they usually only handle either lithium, or Nicd/Nimh.
3. If the charger has aligator clips, then it can be plugged into any 12v power source, whether you car battery, or a plug in power supply.