I've had a battery problem too with my alto (April 2006 model). Original battery's acid leaked, so got a Striker 40 amp battery in November 2006. Then, since last 3-4 months, the Striker battery gave a lot of starting trouble and low output. The suzuki workshop person told me to get a wet 46 amp battery. So today i got an Exide NS48ZL battery. The shop keeper told me that the actual output of the battery is 40 amps, and this is the same with all the local batteries, i.e. 6-8 amps lower output than claimed. He said they started doing this 3 years ago, before that battery-makers were 'imaandaar'. Very sad....sab he chor hain yehan per.