Although they are marketed to be 30 amp
batteries, independent bench testing has shown the
Sony VTC5 as being only a 20 amp battery. The Sony VTC4 has been bench tested to be a true 30 amp battery.
batteries can generally be broken down by two major characteristics: capacity (mah rating) and amps (current handling). Generally when choosing which battery is best for your application, you need to pick which characteristic is your priority, you can't have both high mah and high amps in one battery. This is due to the limits of current battery chemistry & technology. Safety should always be your number one priority.
Battery Basics for Mods; a Definitive Battery Guide