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“In this Instructable I would like to share with you my most recent project, an AVR-based universal battery charger. What does it mean universal battery charger? Well, it can charge batteries. And it can charge all four basic types of rechargeable batteries - that is, NiCd, NiMH (usually in AA or AAA form), lithium cells (usually in the form of 18650 cells) and lead-based batteries (those 12V blocks). On each battery type, you can set multiple charging parameters.”

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