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I am considering replacing the battery in #9517 with a lightweight lithium battery from Antigravity. The weight saving of approximately 35 lbs is significant. However, the cost, by the time I get it to Canada with all the crazy taxes, brokerage fees, duties, exchange and shipping will easily be five times the cost of a lead acid battery purchased locally.

The other factor is durability. I have read mixed reviews on this, and if the battery will not last very long then the cost will obviously not justify the expense.

Antigravity has a detailed video on their website discussing the benefits of their product, and it covers these concerns:  


However, I would prefer to make a decision based on first hand experience, so I am wondering if anyone has purchased a battery from Antigravity and, if so, what your experience has been. Also, are there any other manufacturers of a similar product that anyone has had a good experience with?

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For a 3100 pound car, I don't think the weight savings is worth the cost and additional worry (over charge, over discharge, etc.) and maintenance (cell balanced charging).
I run them in my motorcycles and even there, I didn't notice the weight loss.
They do work well though, especially if there is no key-off current drain.
I like EarthX batteries, FWIW.

I purchased the  AG-ATX20-RS for my Ultima, 680 CCA and more than enough power to turn over and start the 600HP 10.5 compression V8 after a long rest. The car hasn't truly been recommissioned yet to know how  it will hold up over time, but at $287 it really wasn't any more expensive than the previous Odyssey PC1200 and the new one of those I purchased was dead on arrival.

  I'm curious, has anybody seen data that shows cold performance? Lithium ion thrives at 25'c and performance will drop as temps get higher or lower....For a car exposed to Freezing the power from the battery is hindered significantly and may prevent a start.

  At least, there is nothing about the specification here that suggests less than  responsible engineering and care, esp the comments on "cell balancing" and detection for safety, the use of only UL approved Cells...It also seems that the design actually works at low stress--meaning, the battery cells are operated actually below their 'nominal' voltage. This is one reason that the costs are higher (since there is a lot of potential capacity in the pack that is available, but not used), and I'd think longevity on these would be very good (more than 3 years...)--Lee

The Antigravity battery I purchased has a CCA (0 degrees F) of 680 Amps. Most of the data speaks to EV battery performance and not as an ICE battery. The LFP does not suffer from being fully charged and typically has a greater cycle life.

Last edited by joules

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