Yes, even at $15 for a replacement battery that's battery that's better that buying a new light for $40

Assuming the casing and buttons are in good working order, of course.

I do find that the battery lasts forever between charges though. I use the 1 second blink interval. I hardly ever need to charge mine. So if it does last 500 cycles like it should....that's just short of forever. So by the time by battery actually burns out (and doesn't just go haywire like mine did earlier this week) there will probably be a better cheaper light on the market I might want instead.