https://antigravitybatteries.com/pro...tive/ag-h7-rs/

NICE! I'm buying one. 30lbs for $950... I'm good with that.

 

Or save another $550 and over 50 pounds get one that weighs less than 6 pounds as mentioned above.

 

Sure, but I don't want to custom harness it in place.

 

Have we come to a conclusion on this? I'm due for a new battery, already picked up a duralast for $220 ready to be installed, but I can always return it, and god is this thing heavy!

At $4xx, antigravity has 3 offerings that are not direct fit but should work:

Antigravity Group-26 UTV/Car Battery(2post)

Options of 16AH(850CA) for $460+$20shipping and no tax, or 20AH(925CA) for $540+$20. This one does not specify if the AH is actual or equivalent.
LxWxH: 7.75 x 6.5 x 7.24 inches. Weights 8.15 and 8.5 lbs.

==

Antigravity ATX20-HD Battery(4post)

900CA for $400+$20, 30 Amp Hours (PbEq), 15Ah (Actual)
Size: 6.89 x 3.4 x 5.12 inches (LxWxH) @5.18 lbs.

==

Antigravity ATX30 RE-START Battery(4post)

880CA for $400+$20, 32 Amp Hours (PbEq)/ 16Ah (Actual)
size: 6.5 x 5 x 6.89 inches (LxWxH) @ 5.75 lbs.


==

Autozone battery spec for reference

Duralast Platinum AGM Battery H8-AGM Group Size 49 900 CCA

$220 including tax and core charge, free pickup.
900CCA, 1000CA, 95AH, 160 reserve capacity(?), 170 reserve minutes(??)
13.90 x 6.90 x 7.50 Inches @ 60.76 lbs.


==

Now all of the AG batteries have smaller dimension than the AGM, so mounting them shouldn't be too hard.
The ATX20 HD seems to be the best on paper, exactly $200 for a 55.5 lbs weight reduction.

Though should I be concerned about the AH rating? 30 AH(PbEq), 15AH(Actual) seems really small compared to 95AH of the AGM, a quick google search of PbEq yielded this, which number should you use to compare against the 95AH of AGM? Either way, it is at least 66% smaller even with the 30AH number. So in theory, if you run the car thus charging the battery regularly, you shouldn't have any problem, but if you leave the car sitting or using the accessory mode(ignition on, engine off) for an extended time, you will have at most 1/3 the juice compared to a 95AH AGM. Or is it not this simple due to characteristic of lifepo4 battery?

I guess I have answered myself, since I drive the car frequently so I "shouldn't" have any problem, just want a confirmation from experts or experienced users.

Other two questions I have in mind are:

1) how would you connect the terminals with the 4post system, parallel, diagonal, or doesn't matter? Are the terminal securing method the same as AGM?
2) There is no CCA listed for AG batteries, do the stay the same at cold temp as their CA rating?

 

1. I don't believe you will find any of those lithium batteries to have adequate Ah. Based on the rate at which my 30Ah ( 50 AhPb equiv.) will switch itself off when the ignition is left on, that is the bare minimum that you will want to specify.
2. So that the cables will reach, you will want to position the battery and screw in the posts such that the leads are on the right when looking at it from the rear and the neg terminal is at the rear, pos at the front. That's the beauty of the 4 posters is that you can configure them as needed. They do use the same terminal securing method, but you may need to use a post shim on one of the posts as it may be a bit smaller than the OEM post..
3. Yes, CA and CCA are comparable on the lithiums.,

 

Thanks for providing these critical info, I went ahead and installed the AGM battery mainly due to the AH concern, hopefully when this one dies, the technology would have improved and the price dropped to more reasonable range.

 

I'm not sure how old my current battery is (recently bought the car used) but I'm considering replacing the battery with a lithium and keeping the current OEM battery on a charger. If I sell the car, I'll just swap out the batteries and put the lithium in the next ride. I had a Greenlife 100ah lithium battery in a RV trailer and it performed flawlessly. I should have pulled it before selling the RV. These Antigravity look pretty amazing with more features.

I did just recently install a permanently mounted CTEK plug panel in the back and a CTEK Battery Sense... not sure I really need it but it's cool to see what my battery level is.

https://rcagarage.com/shop/batteries...-panel-56-380/

https://rcagarage.com/shop/batteries...-sense-40-149/

 

If you guys are interested in dropping 40lbs... here you go

 

Thanks for posting.

 

great video. Didn’t realize how much that battery was until I looked it up..wow. Wow wow
might be cheaper to just go on the keto diet myself and lose some weight.

 

I installed the Litblox battery a couple of years ago and replaced the heavy factory battery tray (tub) with the Liteblox adaptor bracket. Saved total of 57lbs. Beats any KETO diet.

 

Does deleting the battery tub prevent you from using the other cargo trim? That is, did you have to get rid of the trunk floor and the storage tray underneath as well?

EDIT: Oh I see you have the convertible; the trunk trim is different in the coupe.

 

After much research and speaking with Antigravity, I've settled upon the ATX-30-HD. Should be here in a couple of days. Likely the less expensive ATX-20-HD would have worked as well, new V8 powered Mustang GT350 and Corvettes have used them with success but the extra Ah for the small price difference and lack of weight difference gives more peace of mind. I'll post up after install.

For clarification, this's getting fitted to the X150, however the end result will essentially be the same and no one in the X150 forum has expressed any interest. I will however start a new thread there as well.

 

The F-Type's charging system should be tailored for AGM batteries, which I don't think the x150 uses. Whether that makes a difference, I have no idea.

 

Makes no difference, though mine had AGM fitted. Some X150s had them and some, traditional flooded.

 

My 2010 XKR wasn'r AGM.

 

SCM Sir, are you saying that this type of battery needs to be "configured" to my V6S Vert? or is this "plug n play"? I am clueless regarding electrics/electronics. What is your impression of this particular battery? Do you have suggestions/options

? I did weld underwater for 29 yrs!
Sparky

 

Kept the storage tray, but wished that I could move the battery to the rear center (car battery cable position/length prevents moving) so that I can use the 2018 (2017) tray that gives more trunk space (especially with the smaller battery there is a lot of unused volume below the tray in the vert. Maybe I will do a custom (3-D print) tray one day.

 

I'm not clueless regarding electronics, but have no idea abou the F-Type charging system. I believe (but am open to correction by those who know!) that the system will adjust to a new battery over time but a dealer will always tell you it has to be configured to the car. I replaced the battery in my previous XKR, it didn't go near a dealer and worked perfectly. Unhingd is the man to advise on the use of Lithium batteries and their configuration requirements.

 

Thank You Sir. Much appreciated.