/diy/ - Do It Yourself

i have a bunch of ryobi batteries i havent used in months. i believe i need to discharge then recharge them. what would be a fast way to do this? hit a stump of wood with a sawzawl and circular saw? should i utalize angle grinder and/or hammer drill as well? what uses up the most power?

I have batteries i can rotate through as i do this? i suppose it would be good to rotate through batteries and tools to not overheat anything, ya?