After a year’s service in my Sony AS-30V helmet camera, the Newmowa NP-BX1 lithium cells perform pretty nearly as well as they started out:
Recharging the cells after that test averaged 907 mA·hr within 2%, so they’re still reasonably well grouped.
The camera burns 1.9 W, so the worst of the cells has a 100 minute runtime = 3.3 W·hr/1.9 W × 60 min/hr,.
Our usual weekday rides run a little over an hour and I change the batteries during our longer weekend rides, so they rarely see more than an hour’s use.
A recent 1-¼ hour = 75 minute ride soaked up 687 mA·hr, just about exactly 75% of 907 mA·hr. Gotta love it when the numbers work.
Surprisingly good performance, given the drama involved in finding those cells. I wonder if that will hold next year when I buy another set?
The Smell of Molten Projects in the Morning 