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Save another pound: Ultra lightweight AntiGravity battery mount (or other LiFePO4)

Joined
11 January 2021
Messages
648
Location
Ontario, Canada
For battery weight, it's probably fair to consider the weight of the battery holder as well. I decided to design my own ultralight battery mount for the AntiGravity ATX-30RS, like my previous PET-G battery bar for the 51R (Zanardi) battery, which saves an additional pound over the 9 lb savings with the 51R battery (and avoids the shorting battery bar problem that @centerpunch noted.)

The AntiGravity ATX-30RS battery is only 6 lbs. There are several mounts available, from AntiGravity, Grey market, etc. but they're all over 1 lb, and all seem to need new holes drilled.

This battery bar holds the ATX-30RS battery using the OEM "J" rods and is only ~0.3 lb total, with the rods. Because the battery is narrow compared to the standard batteries, the bolts need to angle "wider" and need gimbals to allow a secure mount. I took some pics without the electrical connections to make it easier to see (Polarity is wrong, but I wanted to show the AntiGravity stickers.) There is some allowance in the gimbals to allow someone to go to the ATX-20RS if they really want to go crazy. Note that this is the 1997+ battery tray:
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Very cool, wish you had designed this before I dropped $250 on the GreyMarkt mount. lol. Also wonder if your mount will work on the early model tray, since the J-hook is positioned differently.
 
That looks great!
I’ll be sending you a PM when I’m allowed to for the file. Just received my ATX-30 after my previous battery gave up the ghost. I will be happy to check fitment on the early battery tray.
I have a ‘91
 
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Very cool, wish you had designed this before I dropped $250 on the GreyMarkt mount. lol. Also wonder if your mount will work on the early model tray, since the J-hook is positioned differently.
Thanks! I allowed ~30 degrees of mobility on the gimbals to allow for the other location of the J-rod slots on the 90-96 NSX's, as well as the ATX-20 if someone was even more of a weight weenie. I'll double check this shortly and update. I was wondering if they'd work on an S2000 - I'll try to check that as well.

Maybe I should get into the battery mount business. I could make them for 1/2 the price and 1/4 the weight. :) Hmmm. Better stick to my day job.
 
I thought that I had accounted for the 90-96 battery tray differences, but I wanted to double check. I checked on a 95 with an original 90-96 battery tray. It works perfectly.
PXL_20240427_122329810-min.jpg PXL_20240427_122333824-min.jpg
From the earlier pictures, it appeared that the J-rods would not be long enough to reach the original battery tray slots (which are level with the bottom of the battery), but I think this is because those are 1997+ J-rods, (31513SL4000 bolt, battery setting, 220 mm) that fit the 1997+ battery tray.

The J-rods that were originally in my 1995 are about 2 cm longer, and work perfectly with the 90-96 battery tray and this mount as shown in the pics. Hard to tell from the parts diagrams but perhaps 31513SB2000 (bolt, battery setting, which doesn't give a length)? 31513SR3000 is for the NSX-R I believe, and is clearly shorter.

It also looks like I could make the shorter J-rods work as well by making the gimbal a little shorter. I'll draft up a shorter gimbal as well. I also had a look at an S2000. That battery bar goes straight over the top, so this won't work.
 
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