MS Band 2 battery dead

I’ve been using MS Band for a few years, initially the original Band and then the MS Band 2. I’ve had the latter replaced twice, but now that device is no longer able to be charged, i.e. the battery is fucked, and of course I’m out of warranty. I love my Band and I wear it all the time, it’s a fantastic little device and I pray to the MS Gods they will bring out a new and even better one sometime soon.

However, what do I do in the meantime, I really need a device for when I go running or walking… Any ideas?