RE: battery charging
Yes your 80 ma charger will give your 2000 mah battery a full charge in about 30 hours if it is fully discharged at the start. You can get by fine with this charge rate if you can take that long to charge it each time. In fact, your batteries will last longer (give you more charge/discharge cycles) if you charge at lower rates. Typically around 0.1C (200 milliamperes in your case) for 15 to 16 hours will give you the longest life. Fast charging usually winds up heating the battery a bit and heat definitely lowers the mean time to failure rate; the hotter the lower the lifetime.