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20 volt portable (battery powered) power packs?

i need a 17-25 volt battery powered rechargeable power pack preferably $50. if you cant find one for under $50 i would still be glad to know where to find one. it needs to have at least one :o shaped socket and can plug into a wall socket (:o shaped thing) and i need it to run for about 5 hours per charge. im trying to run a raspberry pi, screen and usb hub off this if that helps.

Not to rain on your parade, but I seriously doubt that this exists in that price range. Looking at some portable tool Li-ion packs should tell you that. Most are rated right around 3.0 Ah and without knowing the drain on the stuff you're trying to run it would be a guess, but I'm thinking 5 hours is about 2 1/2 to 4 hours longer than it will run here. You won't get quality packs for that price range either from what I'm seeing. Then there is the charging circuitry to consider. Just at an offhanded guess, you'll need more like 5.0 Ah and maybe higher to run this that long and the 3.0 Ah packs are barely in your price range. You may be able to get a better and closer estimate using the design resources at the link below. I wish you luck and hope you're right.

http://www.powerstream.com/tech.html

Good luck, good hunting and stay safe!

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LIONEL 0103 HO POWER PACK TRANSFORMER INSTRUCTIONS PHOTOCOPY
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Vintage Bachmann HO train model railroad power pack and baggage car in box
Vintage Bachmann HO train model railroad power pack and baggage car in box
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Vintage MARX 6020 POwerpack transformer Ho Train Railroad
Vintage MARX 6020 POwerpack transformer Ho Train Railroad
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Gilbert Vintage HO Toy Train Transformer Power Pack 32655
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Vintage RARE MARX HO TRAIN Transformer Powerpack 6020 FR speed control
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Vtg Tyco Golen West Electic Train Set HO Scale Complete w Electric Power Pack
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MRC Railpower 1370 Power Pack AA370
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