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I hate it when people without the first idea about electricity make Instructables with lithium ion batteries. This is TOTALLY UNSAFE, lithium ion batteries need to be charged at 4.2v with a specific cutoff charging circuit. These small circuits can be bought off eBay for less than $1.Follow this persons instructions if you want to burn your house down. Or jump on eBay, spend $1 and save yourself the heartache.
perfectly safe to do this instructable with nimh's but you should NEVER do this with a lipo.
Great job. Simple and gets to the job done. As far as safety goes despite what others are saying it's completely safe and in some respects safer than it was. Due to the lower charge rate to capacity ratio, but you already know this.
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