I've been dealing with rechargeable lithium-ion batteries for a few years now as a consequence of being a vaper, since every device either runs on an internal Li-ion cell, and external cell, or a Lipo cell. I first saw rechargeable Li-ion AA and AAA batteries a few months back and I about lost my mind. :D What a time to be alive! With regards to the chargers for the batteries, what in particular is different about those chargers? Is it the amperage for the charging cycle, or something else? I ask because I already have a battery charger for charging Li-ion cells that are 3.7V.
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The cells have a rim that serves as the negative contact. The spring at the bottom does nothing. They're designed this way to prevent people from destroying them by putting them in NiMH chargers.