Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
super simple uses a third movable "stud" to keep the battery straight across the contacts. springs open enough to charge EVERY old cell phone and tablet battery I own. Spring is stiff enough to hold the battery securely, but not at all hard to spring out to place the battery in for charging.
The swing out plug is a little funky. It is a non-polarized "US plug" that works OK, but doesn't stay in an older wall outlet very well. NO instructions.
Even Google translate had no idea how to translate the writing on the box. Combined with the non-polarized 'almost-US' plug... I suspect this is meant for the Japanese market? Or possibly, it is just a Chinese Unpolarized NEMA 1-15 plug? Either way, It's better to plug into a power strip, with a second outlet supporting the body.
Usb port is a nice addition, if you have a spare phone battery, but no dedicated battery charger. this lets you charge over usb AND keep your spare topped up. Voltage sags a bit under "rated" draw, but still charges phones fine. Would not suggest trying to charge your tablet through that port however.
Charges the batteries. Cheap as can be. Gets the job done.
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