So I've had some problems lately with the last batch of 1.5ohm cartos + ongoing issue of over-saturating them. I'd said before that once over-saturated, I found they still worked fine on auto batteries.
And yes, for the pedantic pilkunnussijas, (if you decide to look that up, be warned the 'f'-word is involved). I do know that something saturated cannot then be over-saturated. Harmony's recent thread on auto batteries somehow convinced me to try autos with tanks again.
Instead of alternating between 2 x 3.5ml tanks of NuMenthol, I used only one tank and used it only on auto XL soft touch titans. I noted when I put the carto in and how many times I refilled it. I was a little confused that a 1.5ohm carto was still only lasting 3-4 days, but then I realised, I was only using one instead of two. That means using an auto battery DOUBLES my carto life AND I was never over-saturating the carto.
I'll say that again: using an auto battery DOUBLES my carto life AND I was NEVER over-saturating the carto. I am getting a much more satisfying vape as well, with oodles of vapour.
Obviously YMMV; this works for me because of my vaping style - I like to take deep drags and I chain vape for up to 30 mins at a time.
Interestingly, my evening vape routine is different; different juice & vaping style. I have stuck with the manual titans and the cartos last as long.