Awesome info! Thank you!
I will just buy multiple colors of battery wrap to group them then label the date of purchase, in that case. Then, I won’t have to hurt myself reading so much. lol
When you test your battery groups upon removal from the mod, are you looking to see if the mod is discharging one battery more/faster than the other(s)? If so, could that be a mod problem (even in series configuration) or strictly a bad/worn battery?
Just my 2 pence on this
The theory behind using married batteries is they work and age together ....as you use a cell, desposits inside develop affecting is ability to both hold its full charge (capacity) and it’s ability to discharge at the same rates compared to when new ....the more recharge cycles you go through on the cell the more this occurs ...it’s a normal consequence of using them time and time again
So if you use any two batteries, say a freshly bought 30Q and a 30Q you had for ages, there will be differences between the two internal resistances. Because the older one is now higher already. When they are called upon to work, the older cell is trying to keep up with its newer counterpart placing more strain on the older cell, thus increasing its resistance further (its working harder trying to discharge at the same rate) which “could” lead to failure .......think of this a bit like cholestoral in the arteries and having a heart attack
Moving on from this what about the CDR? So on a regulated mod use two batteries up to 120w for those 30Q you are sound, if you have 3 batteries 180W....the reason is two fold
1) most regulated mods have a cut off after 10 seconds continual firing but should there be a problem (auto cut out fails and sticky fire button for instance) the CDR rating is the limit at which you can continually discharge that cell from full to cut out without over stressing it...this will give you time to get the batteries out (another reason to use married pairs)
Note though this CDR rating along with a cells capacity reduces as the cell ages ....leading to point 2
2) yes you can use higher amps than the CDR rating, a lot higher in short bursts with rests between but not everyone vapes this way (chain vaping) so saying it’s ok isn’t normally offered out as advice until you are comfortable knowing limits ....think of it like ragging a car continually at high revs, it’s gonna wear the engine quicker right. It’s the same thing on batteries, and the more stress the faster internal resistance increases and capacity reduces, therefore reducing their overall effectiveness faster.
Those that offer this CDR advice aren’t the battery nazis in fact they are just saying it to err on this side of caution and stay safe until you learn more about it all.
Mechs are a different beast and come with their own additional hazards but won’t go into that here as it’s not relevant yet