EverFocus AD4 Battery Charger f/ EN200 & EN220

hi welcome to the EEV blog and electronics engineering video blog of interest to anyone involved in electronics design I'm your host Dave Jones hi it's lithium-ion battery tutorial time why because these lithium-ion battery are cells that you can get these days from hobby suppliers professional suppliers whatever are great for designing into your next product or gadget that you want to build now when you build a gadget you want to building some rechargeable batteries you have a couple of choices one is your traditional nickel metal hydride rechargeable double-a triple-a whatever um batteries right well they're a bit of a pain in the butt they're old hat chemistry there are a low terminal voltage so you got often wire a lot of them in series to get the voltage you want um and they're just in a big painting the but not available in really nice tiny shapes and sizes like these lithium-ion