Found this from 3 years ago. Someone from antigravity batteries posted this on the GT350 site about the atx20-hd and 30-hd. The 20 is $368 weighs 5 lbs. The 30 is $500 and weighs 8 lbs. My car doesn't sit for more then a couple of days at the most. Now I'm thinking again
What would be the advantage of running the ATx-30? Are both of these suitable for daily driving? Can both run accessories like AC, Radio and Dash cam at same time?
Good question... While they are both suitable for Daily Driving, the ATX20-HD has 15 real Amp Hours, compared to the ATX30-HD having 24 real Amp Hours. The 9Ah difference is significant for the following reasons.
1- The vehicle can sit in storage longer without the need for being put on a Charger/Maintainer. So if you are not daily driving so much and let the car sit a good few weeks or month or more... then having more Amp Hours is better. The objective is not to have to put your car on a maintainer unless you store it for longer periods.
2-Similar to above, those 9 extra Amp Hours Extra offer more capacity, so if you have a theft alarm, radar detector or Camera attached to your car the extra 9 amp Hours will power accessories like that much longer than a ATX20HD would when the car is sitting undriven. Many people do not really understand that these extra accessories can cause significant Parasitic Drain on a Battery. And being a Lithium Battery has a much lower Amp Hour rating than a Lead/Acid battery in general, these extra 9 Amp Hours give you more CAPACITY to have the Car be left without a Maintainer on it. The additional accessories that can draw energy while the car is not running can really draw down a battery quickly. And with the ATX20-HD you do not have a lot of over-head to power these things that draw energy when the Car is off. But YES both can be used as Daily Drivers with the ATX20HD being something you may want to have on a Maintainer if you have extra accessories such as the aftermarket Alarms, Cameras and such.
3- The 9 extra Amp Hours means a bigger more powerful Lithium Cell-Pack is inside the battery. Which also means a battery that weighs about 2.5 lbs more. To be clear the ATX20-HD will easily rip start the GT350s.... but the extra power with a larger battery inside offers better starting in for Colder Weather, easier turn over on Built Motors, and if you accidentally leave you lights on in a parking lot while at dinner, or your stereo or something you will have extra power to start the car, even if the voltage has dropped more.
4- The last thing is the ATX30HD is a bit more beefed up inside to handle the larger more powerful battery pack inside discharging currents. So many Race cars, or very high-performance Cars can take a lot of turn-overs to prime or start the motor. So the ATX30HD can handle the higher heat that can occur with long turn-overs or difficult to start motors. This should not be a factor in the Mustang, except for built ones or people who are tweaking on their cars more.
So in conclusion the ATX20-HD should be fine for those into racing or daily driving in Moderate weather, provided those who use it understand that a 5lbs Lithium battery is not an infinite supply of power, it is a compact, lightweight battery for Sports Cars that can handle the electronics draw of a stock vehicle without a lot of extra high-draw accessories, or big high wattage stereos. In that use it is fine. Also note that when the car is running, all your accessories are powered by the Alternator for the most part, so the battery won't be affected too much. Its just those aftermarket accessories that create larger draws and are pulling energy from the Battery when NOT driving that can make the ATX20HD not the ideal battery for that type of application with a lot of extra accessories.
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