Seems like you're a prime candidate for a battery mod.
Other than that, I think every supplier could would be happy to sell you a charger or two...
You could also buy another kit and have two more dead
batteries waiting for a charge...
I had six
batteries, wasn't enough, now I have five and a Nico stick mod, and a home made USB gizmo...
now I have five batteries fully charged and waiting for when I'm away from my mods...
Check it out, pretty easy problem to solve via the Battery mod route.
Regards
fo