While I understand the urge to do otherwise, I think the best advice for best possible battery life is to fully charge before the first discharge. Even 'overcharge' (I recommend four or more hours past 'full') before the first discharge by heating.
This is the first time only. Once the first discharge happens the potential advantage is lost.
This can help set the capacity for the bank as high as possible. This will slowly degrade over time of course, but the higher you can set it the longer that will take and the more 'sessions per charge' you will enjoy from then on. Probably not a big difference in most cases, say several percent, but worth considering. New owners are encouraged to do so if that kind of stuff (best battery life) interests you.
Ironically, after that first cycle, the 'smart money' says to avoid completely charging if possible. Stopping 10% early might cost you 'a session per charge' but will DOUBLE the number of recharges before the battery needs replacement. Two times more recharges. Twice as long as normal? Every time you do this (stop at 4.1 Volts per cell, 8.2 total, rather than 4.2 for 8.4 total) you get a 'free recharge cycle. Stop .2 Volts lower and you doubt it again. Two sessions per charge less but four times the charges before replacement? Not a hard call for me to make.
Not as big a deal in a vape like Air where replacing the 18650 cell is cheap and easy, but in a unit like Solo (either model), Ascent and so on it's worth considering I think.
BTW. this effect (shortened life from full charges over extended times) is why you get new 18650s and battery packs at 'about 3/4 charge', because makers know full charge will slowly kill the battery just sitting in stock.
The military typically specifies 3.95 plus or minus .05 Volts (3.90 to 4.00) rather than the normal 4.20 (4.15 to 4.25 Volts) which of course gives more 'sessions per charge' but also sells more replacement battery packs sooner. Both things 'suits' (sales types) favor. The Military, OTOH, is trying to avoid replacement of battery packs in the field. They'll sacrifice some battery life (per charge) to get it.
It's an 'owner call' of course, but I think part of informed choices includes such considerations? I believe it enough to build a 'gadget' to automatically stop the charge early, one model looks like this:
The normal charger plugs in upper right, the cable into Solo. Pushing the button (lower right), which pokes through the cover, starts the charging by the transistor in the upper right corner. When the level reaches the point set by the blue adjustmeent between the switch and transistor the processor on the left shuts the charging down and beeps the beeper to let you know. There are, I think, 8 or 9 Beta units out there with some of the usual suspects. AFAIK none of my kluges has broken down (some of the first were hand made and a bit crude) and nobody using one has killed their Solo battery yet? I personally have tried very hard to wear my original (four year old now?) Solo out without much to show for it. I still get 'a session per LED' on it.
OF
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