How long do I have to let Fukuyama batts rest between charges? Is it ok to let the batts cool down normally for the first 30 minutes then put it in front of a fan for another 40 minutes then charge again? By that time, the batts seem fully cooled down. Is traying the batts before every charge recommended? And is it ok to use fukus up to three times a day? Hope to prolong the life of my fukus. Thanks.