if you're going to try used laptop cells (18650) you should know that you will have to test all the cells. and this takes a long time.

here this 4 cell tester (available soon on the website) will provide 4 amps (1a /cell) charging and 1amp discharge.
The bigger the capacity the longer it takes, the 2400's take around 5 hours and 20 minutes....
well that's not entirely true as the batteries were charged to 4.12 on a separate charger (as seen in previous video) for over 4 hours.

#hiddenfacts
#laptopbattery
#powerwall

I've done around 400 cells.. taken over a month.

www.renewsolar.co.uk

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