Motorised Weeder for use in SRI method of paddy cultivation

I am looking for a motorised power weeder either Konoweeder or rotary weeder. It would be intersting if some one can suggest as to where I could find this.

It would be all the more interesting if it can be powered with the help of a rechargeble battery.

Can some one please throw some light??

best regards
p.s. nathan