open source circuit simulation software with battery support?

[impetus_maximus]

hello,

any electronic hobbyists out there know of a good open source circuit simulation software that supports NiMH, and Li-ion batteries? was trying 'circuit lab' til they made me sign up. signed up, then a few minutes later they locked me out and asked for $$$

i'm trying to test a simple NiMH trickle charger circuit.

thanks for reading
/max