Howwe tested them

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WE started by mak­ing sure that the max­i­mum out­put matched the sock­ets on each unit, plus we looked for at least one 2.1-Amp USB con­nec­tion to cater for tablets. We also wanted leads that were of a use­ful length, as well as a way of at­tach­ing the units se­curely.

Power in­di­ca­tors were also use­ful and we liked to see bat­tery charge level mon­i­tors – handy for mak­ing sure power-hun­gry de­vices like cool boxes don’t sap your car bat­tery too much when the en­gine is off. The fi­nal fac­tor was price from on­line sources.

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