18650 Battery Store
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Best prices for quality Li-ion batteries.
I have purchased quite a few batteries from 18650batterystore.com and their prices are among/pretty much the best. I use them for high-end flashlights that need a lot of juice pushed through them. Great brands like Molicel and Samsung can be found, as well as others. Compare prices and you'll wind up buying there. I had an issue with an order but their support person took care of it and I will be shopping there next time I need more. See for yourself, the inventory available is great.