These batteries can be charged with any charger that charges NiMh batteries. It should say that on the charger's package. When charged, you just use these batteries like any other batteries, based on the size. For example, the "D" cell batteries can be used on any appliance that takes "D" cell batteries.
I do not believe they have a specific warranty, but packaging says they can be recharged 1,000 times. I can tell you I purchased mine last October, have recharged them over and over and they are still going strong.