Has anybody actually kept using their battery's they originally purchased?

[rsgars]

I have three 510 batteries. Two will fit in a little eyeglass case in my jacket pocket. Two flavors available at all times works for me. I will use them untilnthey die, and perhaps replace them just for the convenience factor

 

[Grimwald]

My very first battery, a sleek silver Volt cig-a-like is now 10 months old. I still use it for out and about, and for bedside at night. I know it won't last forever, but it is the battery that got me off analogs, so I have a soft spot in my heart for that battery. I may frame it and hang it on the wall when it dies.