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Got some very nicely priced good quality 26650 batteries for my torches. Only trouble is the plus side doesn't protrude enough to make contact with the next battery in the chain, so I have to use a washer inbetween (pic related, the type you have between the plate and nut).
Seems to work fine, but will I regret this in the long run? Maybe there will be some weird interaction between the metals and power running through them besides just corrosion?