I'm scavenging 18650's for an ebike build, and (unless anyone has a better suggestion) am getting the batteries from new laptop batteries as I come across them on ebay.
Problem is, as some of you know, some ebay sellers have a tendency to cheat when they feel they can get away with it. So my concern is buying batteries advertised as new but receiving used ones. The only way I'll be able to tell if they are used, or at least severely used is to check the capacity of the individual batteries once I get them out of the Laptop battery shell, so I need to know what the capacity should be.
For that reason, as well as knowing approximate individual 18650 capacity before I even buy the battery so I know what to buy or not to buy before hand, (looking for minimum 2000mAh capacities) I pretty well must have the formula to figure this.
We have the numbers on the assembled laptop batteries themselves, such as 8000mAh 4000mAh 5200mAh 4400mAh and so on to work with prior to buying and of course some LT batteries come with 6/9 or whatever individual 18650's batteries each, so I may also need to know how they are generally wired for any given amount of batteries, but I don't won't to get ahead of myself here. Hope there is a simple way as my knowledge on this stuff is limited. Can't seem to find the info anywhere so any help would be appreciated.
FWIW, I have something to calculate individual 18650 capacity.
Problem is, as some of you know, some ebay sellers have a tendency to cheat when they feel they can get away with it. So my concern is buying batteries advertised as new but receiving used ones. The only way I'll be able to tell if they are used, or at least severely used is to check the capacity of the individual batteries once I get them out of the Laptop battery shell, so I need to know what the capacity should be.
For that reason, as well as knowing approximate individual 18650 capacity before I even buy the battery so I know what to buy or not to buy before hand, (looking for minimum 2000mAh capacities) I pretty well must have the formula to figure this.
We have the numbers on the assembled laptop batteries themselves, such as 8000mAh 4000mAh 5200mAh 4400mAh and so on to work with prior to buying and of course some LT batteries come with 6/9 or whatever individual 18650's batteries each, so I may also need to know how they are generally wired for any given amount of batteries, but I don't won't to get ahead of myself here. Hope there is a simple way as my knowledge on this stuff is limited. Can't seem to find the info anywhere so any help would be appreciated.
FWIW, I have something to calculate individual 18650 capacity.