Top quality rechargeable batteries for $20

(update: price raised to $27, but at least shipping is free for those who don't have Amazon Prime)

Amazon is selling a kit of Eneloop rechargeable batteries for $20.  This is a pretty good deal on these batteries -- usually $20 gets you only 4 batteries at a place like Best Buy.  This kit includes a multi-use charger, 4 AAs, 2 AAAs, 2 Cs, and 2 Ds.

The two reasons to get Eneloop batteries are:

1. Go green.  Rechargeable batteries are so much better for the environment.



2. Eneloop batteries are low self-discharge batteries, which means that they retain most of their charge even if you don't use them.  Conventional rechargeable batteries lose their charge in a few months, meaning that they are a pain to maintain.