I have just bought a 2001 Prius. Once, when I the car was not driven for a week, the battery was dead. I started with the help of cables and another car. Now, first step is to replace the battery. But, according to the toyota service records, the battery was replaced in 2008. And the present battery is an aftermarket battery, which the previous owner must have installed in 2010-2011. It's not a particularly cheap one. Plus owner minus two remembered that the car had a habit of discharging the start battery. Also, it has an aftermarket charger/engine heater/cabin heater system installed. I would like to rule out leak currents before I buy a new battery. Are there any known sources of leak currents in the first gen prius?