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Subscribe for more videos (every Wednesday and surprise specials): http://goo.gl/QjZqko I have several instruments that use 9v batteries, so I thought it would be a good idea to try these rechargeable batteries with lithium cells and micro USB charging input. Did you like it? Thumbs up. Did you not like it? Comment so we can improve. Do you want to see more? Subscribe, it's free :) Do you think it can be useful to someone else? Share the video. Regards.