QUOTE(electron @ Feb 24 2012, 08:11 AM)
i think the 1 year warranty is for the 12V battery that traditionally sits in the engine bay of most car
I had double check with the SA, he told me it is 1 year warranty for hybrid battery, but I also remain skeptical about it because I felt my SA knowledge about this car is not so well, probably someone can get confirmation from the authority.
Regarding the hybrid battery, although it is NiMH battery, the way hybrid car charging and discharging the battery is not same as mobile phone or laptop, instead, hybrid car use hypercycle technique to extend the battery life. normally Prius use about 10% of Depth of Discharge (DoD), below is the DoD and charging cycle number (life time)

so if DoD is 10%, you can discharge the battery up to 300,000 cycles compare to normal NiMH battery 500 cycles.
If the usage is 1 cycle per KM, the battery would last about 300,000KM, adding the high temperature weather in Malaysia that caused battery recharge cycle to reduce 20% less, it is estimate can last 240,000KM, if you travel 20,000KM per year, the battery can last about 12 years.
Some few tips to prolong the hybrid battery life
1. Don't drain you battery to the low level (although the computer will prevent it, but abuse still may possible), such as use EV mode extensively
2. Don't set the AC temperature too low in the hot day when stuck in traffic jam, because it is possible to drain your battery to low level, which increase the DoD.