can you prove that? It was my understanding that they should be charged as rarely as possible, because the time at full capacity was damaging to the cells.
Of course,i am not calling you out,i am hoping to be proven wrong.
Life of a battery especially in our application is all based off temperature and charging/discharging. With the right charger, I am talking a pricey one from the likes of Pila and some other higher end chargers where you can set the charge limit on the battery to 4.1 or 4.15 volts to end the charge cycle will extend their life. Not discharging a battery below 2.5volts before recharging also increases their life. Stressing a battery by going over 60 to 80C constantly or discharging them below 2.5volts is where the most damage is caused to the internal chemistry and rapidly decreases not only maximum capacity and output, how many charge cycles, normal charge cycle is 1 cycle, discharge below 2.5volts or overheat the battery decreases life by 1.05 cycles each time you do so. Most regulated mods shutdown output at 3.0 or 3.2volts as the lowest battery stated they will discharge from, so there unless on a mechanical is one automatic life extension mechanism in place, most vapers generally recharge in the 3.5 to 3.7volts range, I'm in the 3.7volt camp, especially on my mechs, so recharging 0.5volts is far more gentle on the battery than 1.7volts, because as they charge they generate heat when doing so.
I've got early Feb 2014 Sony VTC4's that are now showing their age, their Mah output is not as long as they used to be, the worst of them probably close to 450 1/2 charge cycles on them, they last maybe and hour to 45minutes on a charge in mech with a 1.0 to 1.2 ohm load where my newer ones last a good 3hours or more per charge. I've also killed VTC4's in less than a month, constant cloud chasing super-sub-ohm loads in the 0.18 to 0.25 ohm range and constantly cycling 8 of them on the charger, I would have all 4 bays constantly going on the charger, so that constant abuse I definitely didn't get 250 or even 225 charge cycles on those batteries. When I first started using mods that needed 18650s and other batteries, you can probably still pull up a lot of the threads I was seeing about extending battery life in the search bar on the forums here, that was back in Oct and Nov of 2012 to Jun 2013 era. Do I have hard data charts of my own personal experience, no, I didn't keep that much detailed data per battery, just my experience using techniques I read on the forums here, old RC car forums, and google searches. Have I seen an improvement in battery life by being more conservatively gentle on them, yes, YMMV