There is a lot of battery information available.
IMHO This site covers it most comprehensively.
Item 6 is a must read.
I think in the early days battery technology was left behind as they looked for the perfect EV car - now there is more money than every before being poured into the battery sector and EVs can only benefit from this.
For long period care of battery is must if we check battery water time to time and charged fully the life of battery automatically long, I am worked as battery experts in [B][U]Batterybhai[/U][/B] and give cool suggestion regarding car battery.