Best Battery Replacement Options

[eacmen]

Worse than traditional ones lol

https://youtu.be/FfmrqWdm-mw?t=156

Wow. Glad I installed those rubber terminal covers. I don’t run with the plastic battery compartment shelf anymore since I need access to the restart button on the battery. I’ve often worried about a stray wrench or something shorting the terminal.

[heinzboehmer]

I don’t know how lithium batteries react when shorted to ground but traditional ones its dangerous.

Worse than traditional ones lol

https://youtu.be/FfmrqWdm-mw?t=156

[ZHPizza]

Just to provide a data point: Car sat in the garage for 4-6 weeks (battery connected, no charger) and just started right up without hesitation.

Antigravity ATX-30

[ZHPizza]

I would not trust that in a wreck.

Background: We had a CSL battery in our old car with the OEM mount. Cranked down the mount and the battery was TIGHT. Passed tech at every event, even the anal ones. Got in a wreck on track and the battery still shifted and shorted to the chassis and was hot to the touch. Marshals got to it real quick so it didnt start a fire.

Keep in mind its not just about flying away, the battery can’t shift at all in a wreck.

I don’t know how lithium batteries react when shorted to ground but traditional ones its dangerous.

Personally I would reconsider this solution.

Thanks for the input! I obviously hadn't considered the potential for a short after an impact. I have some aluminum I can fabricate into a more sturdy strap like above. Appreciate it!

[hsq]

I went with an H8 sized Wal-Mart Platinum Ever Start AGM & love it. The car has sat for a month and NO PROBLEM cranking! If you track the car you might be concerned about its weight. H7 is the standard size but the H8 fits into the existing bracket perfectly with no mods. It's all about what you do with your car.

Like this one?: https://www.walmart.com/ip/EverStart...0-CCA/40647529

[eacmen]

I actually bought some stretchy velcro straps for mine lol

Saw a guy post about that setup in an e90 and was like well shit I guess it really makes sense for holding something that light.

https://www.m3post.com/forums/showpo...72&postcount=6

I would not trust that in a wreck.

Background: We had a CSL battery in our old car with the OEM mount. Cranked down the mount and the battery was TIGHT. Passed tech at every event, even the anal ones. Got in a wreck on track and the battery still shifted and shorted to the chassis and was hot to the touch. Marshals got to it real quick so it didnt start a fire.

Keep in mind its not just about flying away, the battery can’t shift at all in a wreck.

I don’t know how lithium batteries react when shorted to ground but traditional ones its dangerous.

Personally I would reconsider this solution.

[ZHPizza]

Good looking solution 👍, about pull a trigger on ATX-30 will need mounting solution.


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I actually bought some stretchy velcro straps for mine lol

Saw a guy post about that setup in an e90 and was like well shit I guess it really makes sense for holding something that light.

https://www.m3post.com/forums/showpost.php?p=22107272&postcount=6

[TramRam]

I went with an H8 sized Wal-Mart Platinum Ever Start AGM & love it. The car has sat for a month and NO PROBLEM cranking! If you track the car you might be concerned about its weight. H7 is the standard size but the H8 fits into the existing bracket perfectly with no mods. It's all about what you do with your car.

[Nate047]

Just get an OPTIMA Red Top with a BimmerWorld mounting tray.

[hsq]

For a street car that is driven once every 2-3 weeks, would you guys recommend the Champion H5 or H7?

Wanted to know your opinions both in terms of fitment (easiest to install and fit) and in terms of starting reliability without a trickle charger. Or if you guys recommend a better battery/set up for cars driven once every 2-3 weeks.

Below are links of the sample batteries in this thread:

https://www.pepboys.com/champion-agm-battery-group-size-h7/product/2071662

https://www.pepboys.com/champion-premium-battery-group-size-h5/product/2292762

Thanks.

[eacmen]

Good looking solution 👍, about pull a trigger on ATX-30 will need mounting solution.


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Thanks. I’m not aware of any off the shelf brackets. I think you’re going to have to fabricate something.

I had a hard time finding battery post nuts for the charger pigtail. I got sick and tired of hooking up the tender/charger clamps to the battery terminals. I found these worked well for the motorcycle-style battery terminals and let me mount the charger pigtail to the battery permenantly:

BikeMaster Battery Bolt 6x10mm... https://www.amazon.com/dp/B004C1ZRMO

[Ghost_M3]

If its a street car with options (radio, heated seats etc) then just go for OEM equiv (H7 i believe).

If its a track car or dont have much electronic options then the CSL/Mini battery is a good ligherweight option (H5 i believe)

Beyond that is the lithium options which are big money and a pain in the butt for a weekend street car, but worth it for a track car.

I own an antigravity battery and I don't mind it for a track car I know I would hate it on a street car.


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I love the antigravity battery for my track build. Same size as oem so I didn’t need to modify the battery strap but and it’s about 6lbs

[Norocehcap]

I went with a Champion H5 for $125, slightly smaller and lighter then stock H7 and have had no problems in my weekend streetcar.

[Radekxpl]

Sorry it took so long. Just got the car back in the garage. Here are the pics of the bracket that was fabricated for the anti-gravity battery. Basically two L brackets and one large U bracket. Some flat aluminum bar stock and a metal brake should make easy work of this.

Good looking solution 👍, about pull a trigger on ATX-30 will need mounting solution.


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[eacmen]

The car is in storage right now. I'll snap a pic next time i go see her.

I would seriously reconsider getting the restart button if you can. Otherwise you will need a jump starter if the car sits for too long.


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Sorry it took so long. Just got the car back in the garage. Here are the pics of the bracket that was fabricated for the anti-gravity battery. Basically two L brackets and one large U bracket. Some flat aluminum bar stock and a metal brake should make easy work of this.