Fernando, regardless of what generations they are, I would not try anything else right now. I suggest you disassemble the iPod's using these guides. clean them properly, The Rice is a great first aid but does not fix them. Use this guide for that. It was written for a iPhone 3G but all the points stil apply to your iPod's as well. After you clean them replace the battery and reevaluate for any damage. To identify your iPod, check here, and here. Hope this helps, good luck.