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RE: STEEM Mobile Update: Witness My B.O.B (Big 'Ol Battery). 500 Watt Hours of Portable Power!
there is no battery inside.
inside is the electronics ..the inverter and the battery charger.
when you plug it into the wall it's a battery charger...four at once.
when it's NOT plugged in...it's an inverter...the batteries provide the power.