Don't throw away your old rechargeable batteries. Most of them may be re-useable again after restoring them back to new. I'm not talking about recharging them, restoring your batteries is fixing them back to almost new condition so you can continue using them after they reached the end of their original life span.
So many rechargeable batteries are thrown away each day that the land fills or even the side of the road could be spared some of this trash if we only learned how to take advantage of reconditioning batteries. Yes they will eventually make their way to the trash at some point but you are at least helping to reduce the number.
Reconditioning or restoring batteries is not difficult to do, it can be done at home with some basic tools or instruments. You can restore most types of rechargeable batteries and about 95% of used batteries can be restored. There is a simple test you can do to old batteries to see if they are worth reconditioning.
You could collect old batteries like for battery powered tools that people discard and recondition them back to life and sell them at a discount. You could probably get these batteries for free because most people are not sure what to do with them and would be glad to give them to you.
You could even do this process with the battery for your car, golf cart or boat batteries. Why buy expensive new ones when you could put the battery you thought was dead back into action.