Best battery? 18650 or 21700

[Gaogier]

Hello

I have a good handful of ultrafire 18650 batteries for my torch, problem is I go through about 6 batteries every 30 minutes. They are really poor.

My torch takes both 18650 batteries and 21700, which should I go for? Can you recommend a battery?

 

[Harry Bloomfield]

I have a good handful of ultrafire 18650 batteries for my torch, problem is I go through about 6 batteries every 30 minutes. They are really poor.

You do know, that they are rechargeable, lithium, don't you?

18650 batteries and 21700, which should I go for?

21700 is a higher capacity battery, than the 18650, so the answer is obvious.

 

[opps]

https://www.reddit.com/r/ebikes/comments/wbnakm/comment/ii8tn66

 

[Gaogier]

You do know, that they are rechargeable, lithium, don't you?

Yeah, they just don’t hold the capacity, I took an old drill battery apart last year which had 18650, 2 out of 3 were completely dead, this battery eventually died too, about 15 hours of use.

21700 is a higher capacity battery, than the 18650, so the answer is obvious.

You would think, but I have a microscope that uses a 21700, and it’s a decent battery, I looked up the price and it was 3 times the cost of a “good” 18650.

Batteries that say they are x capacity doesn’t really have real life usage stats. These companies are flying out batteries and torches claiming 50,000lm but only give 250 for example…

I have learned a lot from the guys who actually test tools, batteries, torches etc