Originally Posted by JoelWisman
It's been covered in other threads but not this one.
The battery you are showing is an 18650 which is much smaller then 26650 cells used in Powersports batteries. It is also Chinese made and probably a piece of junk.
The consensus in other threads is you could build a battery for about half the price using equivalent quality cells but it takes a fair amount of work and you end up without a tough water proof case, warranty, or meaningful short circuit protection.
Figuring my time is worth more then $5 an hour, it wouldn't save me any money cobbling a battery together with my tools versus letting someone else do it with production equipment.
Thanks Joel, and to others for this thread it's awesome. Took me a week to get through it - extremely informative! (subscribed)