I own an old, 2004 model Toyota Corolla. I changed the battery previously one year back. The battery is Diehard AGM Powersport 9BS. I am taking my vehicle for engine tuning and engine upgradations to get sports performance. A friend told me that using power batt can improve the performance and lifespan of the battery. This is the first time I am hearing about it. Is it really good for the battery as it claims? How much would it cost to use it on my battery? I need your suggestions. Thanks for your time.