Would you not just be better off getting 1 (or more) spare batteries. Charge them and swap them out as needed.

Only takes a minute to power down, swap battery and power up again. The batteries are quite reasonabley priced.

If having to use the device to charge the extra batteries is a problem, find the cheapest other Nokia phone that uses the same battery and pick one up off eBay and use that as a second charger.

Tha't my plan anyway, though I don't think I'll bother with a second phone for charging. Swapping is easy enough...

Zuber