Though this reply is not so timely.... but I think it is good to post information that other may find useful.
Well, the Batteries we use in Cars are referred to as Lead Acid Batteries and in order charge you only need a a very simple DC Voltage Source (called Step Down Transformer + Rectifier) or Charges as it is normally called.
Please note that to charges a 12V Dc (Car battery) you need a charger which could deliver 13.8 ~ 14.5 Volts DC (max.) and 10 ~ 15 Ampere current.
There are few shops in Karachi (Garden East Area) where battery Charges are Available and it is really very interesting that price are not fixed. Usually they sell small battery charges for Rs. 4000 ~ 8000.
Anyone can save upto Rs.2000,if you play smart DIY (Do it Yourself) for ask someone any Electronic Technician (in the Corporative Market Area) to make one for you.
Normally 800cc to 1300cc cars have 40Ah to 65Ah batteries and these batteries could easily be charged in 10 ~ 14 hours (slow charge is better)
Please feel free to ask question, i would love to answer.