Well, since you've asked dr_frost_dk... I was just going to check "the market" and get some pre-orders maybe. Looks like I'll have some spare time and could possible make some dual batteries but if nobody's interested I'm reluctant to spend my hard earned money.

BTW dr_frost_dk have you ever considered/tried building triple or even quadruple battery? Just ignore the fact that n900 would like heavily blown over muscle car...