Hehe 3.45v is low? I vape mine down to 3.2V which is when I normally get Weak Battery - sometimes 3.1V on the ipv4.
I read a lot of reviews on a site called lygate.dk, he's a flashlight guy who has extensively tested hundreds of batteries and chargers. He tests that they will drain down to their spec level of 2.9v, and usually confirms that he can continue to drain them even lower without problems (down to 2.5v on the Samsung 25Rs I believe.)
I don't fully understand why it's a problem going down to 3.1 or even lower volts, at least on mods which don't sag at lower volts? I guess the battery doesn't last as long - but how much less are we talking? If it's the difference between lasting two months and a year, then OK that's fair enough. But I'm thinking it's more like 6 months versus a year, or that sort of magnitude? In which case, at £5/$8 per battery, I'd rather have the convenience of far fewer swap outs at the cost of re-buying twice a year rather than once a year (or whatever it works out to.)
Am I way out on these estimates?
Nah, you're good IMO.
You can take these cells down to 3.1-3.2V, even a bit lower for some cells, without significantly affecting cell life. Just recharge them soon, not at high current, and you'll get plenty of life out of them. It can be a problem if the cells are severely overdischarged though and then rapidly recharged. They don't like that. A standard for the manufacturers of the chips running a lot of better chargers is to slow charge until the cell rises up to 2.5-2.8V and then charge at the full rate. Keeps the heating to a minimum.
You can also extend cell life by only charging to 4.0-4.15V, instead of 4.20V. But you're reducing the cell capacity (vaping time) to gain that extra cell life. May not be worth it. And, your charger may not give you that option.
[edit] This all assumes we are talking about the actual cell voltage. You must take any voltage drops between the cell and what's measuring the cell voltage into account!
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