This website is a resource of information on batteries.
Very good unbiased information on batteries, especially pertaining to R/C use.
Red Scholefield gives a talk on batteries.
Excellent souce of information from Eveready Battery Company.
Information on Lithium Polymer Batteries.
Information on Lead Acid batteries.
Charging NiCd Batteries
Excellent FAQ on NiCds.
Nice source of battery info.
Battery testing information.