Download video: Streetwize SWPP5 5-in-1 Power Station jump starter review
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Looking on Google, even the battery manufacturers can't make their minds up whether the SJ12V17AH battery is 5.7Kg, 5.25Kg or 5.2Kg. Obviously a tricky question to answer when you're lying through your teeth - the battery's 4Kg, about two thirds of the weight of a genuine 17Ah battery.
To think people pay £80-£100 for these things!
4:20 Inside the jumpstarter
12:05 Inside the battery
14:44 How to tell if yours has a fake battery
16:45 How to fit a replacement battery
21:10 Mains inverter output
22:07 Final thoughts