Sorry, fell behind.
A few things I didn't see mentioned that I think Should be:
1) buy your batteries from a reputable source - Amazon and Ebay are generally not a reputable source unless you are familiar with the seller. There are a lot of knockoffs out there
2) cheap ohm readers can be off by as much as .1 ohm - so be careful
3) With mods that run batteries in series make sure you get them from the same place, charge them at the same time and only use them together.
This was mentioned, but I wanted to expound on it a bit:
Just be cause something hasn't happened, doesn't mean it won't. I was watching youtube videos of exploding IMR 18650s, and most of them didn't have a violent reaction beyond the expected venting (no explosions). That said it's not worth it to me to risk it. Also, a battery venting can spew hot toxic(?) gas through the atty into your face. Running a build over the continuous amp rating by a few amps may not immediately cause the battery to explode, but it is stressing the battery beyond the manufactures recommendations. This likely damages the battery if continually done.
