Amen to that. My current method is to rock a 2 battery mod (operating within a similar temp range) and keep a pair of fully charged batteries on deck, either in my car or in my pocket. I have 3 paired sets and leave the house in the morning with fully charged dual batteries in the mod and 2 fully charged batteries on deck.
Does anyone know whether the iJoy Maxo Zenith box can fit the TFV12? The mod angles upwards behind the 510 connector which might block the large midsection of the TFV12. I wonder if the Zenith can last all day since it doesn't consume any power except for and when firing (single button, no screen, just has an analog voltage meter). If 3 batteries can keep that running all day, I might have to pick one up. You can get the mod plus 3 batteries for around $50 and if they last all day, I wouldn't need a second triple battery set.
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