A thread for discussion of makes & models for use in 'stacked battery' mods.
The goal of this debate would ideally be the ability for ECF to say:
"ECF believes that for 6v use (2 x 3v) the best options are:
Smith 16340 Li-Mn 3.2v model XYZ123
Jones Li-FeO4 3.2v model XYZ456
For 7.4v use (2 x 3.7v) the best options are:
Smith 16340 Li-Mn 3.7v model ABC123
Jones Li-XxXx 3.7v model XYZ789.
ECF gives this advice based on safety, not performance."
We needed a simple, straightforward answer for the best single-cell configuration battery, and the answer we decided on in the end was the AW IMR 18650. It isn't right for all circumstances but it is an all-round safe choice, with the benefit of being a simple answer. There is a huge benefit to having a simple answer even if it isn't always perfect.
The end result here, for 2-cell configurations, needs to be a simple answer if possible - a 6v and 7.4v result where we can keep people safe. That is the main consideration. Ultimate performance under differing duty regimes is not a consideration here.
As before, there is no liability for testers, as in the end the advice will come from ECF. We need safe choices above all else. Ultimate performance is not the issue here. For example, using a pair of a certain make of unprotected Li-ion cells might give easily the best performance - but we could never recommend that under any circumstances. We need safe.
To go forward, how about if people post their nominations for batteries that could be considered. Let's just throw in all the names and not worry at this stage about the finer details, all that can be worked out later. The only thing I would ask at this point is: please don't suggest unprotected Li-ions since even if they will potentially run a space station for ten years, we won't be recommending them.
There are many questions to be asked, such as: what about protected Li-ions? And: I really like Tenergy Li-FePo4 even though they are only 50c each on Alibaba? Good - just chuck it all in please :-)