lego nxt battery charger circuit

[bbgil]

i have a lego mindstorms nxt but the battery included does not include a charger. it is a li-ion polymer battery. i was looking for a charger but its too expensive. planning to create one but need help on the schematic. Anybody got a link or can upload a schematic that can be used for this? quite urgent. thanks in advance.

 

[gebepic]

see my post about battery charger and come back on my Pb if ok for you

 

[bbgil]

hi. can't seem to locate ur post. I found the others but not the one for battery charger. Hope you can repost it again. thnx