Is it possible for the n900 to provide a low (under 50ma) current output to charge a bluetooth adapter?

I've tried it with a female/female adapter using h-e-n, and a BT adapter that charges via usb, the battery is a 180mah 3.7 lipo ina meelectronics air-fi a9. It originally had a 100ma cell, but i swapped it out with one i had from a broken s9-hd to get a few more hours of playback time out of it. It charges fine via normal usb hubs, wall warts (ac/dc adapters), and my laptop.

Basically, can the n900 via software/wiring methods, push ~50ma out to charge this adapter? I don't mind carrying around a few extra bp-5l's, but i had to solder the 180ma cell into the bt adapter.