Here's my experience (your mileage may vary):
I got two auto batteries with my starter kit (from another vendor) and one manual batt from V4L. Had them all about 30 days.
I gave one auto to my wife, who vapes only occassionally.
I use the manual pretty much exclusively, hitting the auto only when I want a flavor change, once or twice a day.
I'm not a heavy vaper: 4-5 drags every 1-1.5 hours (maybe 40 drags a day?)
Use the manual Passthrough at night at the computer while the batts are charging.
I charge the manual every night, no matter how much I've used it.
I charge the auto every couple of days, whether I've used it or not.
I charge my wife's auto maybe once a week.
All 3 have seem to perform the same following this regimen--they do seem to be slightly more powerful immediately after a charge, but I don't notice any major drop-off in power throughout the day and they haven't seemed to lose their charge any sooner from constantly recharging them.
I guess only time will tell if this is weakening their ability to either take and/or hold a charge.