Testing an Aux batt solution...

[Porpoise Hork]

Well crap, I missed that... Thanks for pointing it out. I wonder what the actual AH is then.

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[Snakebitten]

Ah = KWH * 1000/V

.048 x 1000/12 = 48/12 = 4AH

If I'm not mistaken.

And I think most of the batteries discussed here are LFP batteries with built in BMS.

 

[Porpoise Hork]

Thanks for pointing that out guys. Saved me a bunch on what would have been an expensive mistake. lol.

Whelp back to the drawing board then.

 

[Jmitchelltfo]

Ah = KWH * 1000/V

.048 x 1000/12 = 48/12 = 4AH

If I'm not mistaken.



And I think most of the batteries discussed here are LFP batteries with built in BMS.

I looked way to fast at that. Didn't even register that the capacity was that miniscule.

 

[Porpoise Hork]

Me too. Definitely not worth it for a lithium battery with that small of a capacity.

 

[Jmitchelltfo]

Me too. Definitely not worth it for a lithium battery with that small of a capacity.

If you're already running a 20ah LFP, what was your intent with swapping that battery? Are you having any issues?

 

[Porpoise Hork]

I have a 20ah in place but wanted to see if there's a battery with the same or increased capacity that would fit in in the factory aux tray location.

 

[Tank]

I have a 20ah in place but wanted to see if there's a battery with the same or increased capacity that would fit in in the factory aux tray location.

I scoured the internet when I created this mod about 3 years ago...and at the time, the O'Reilly Super Start was the only option that would fit

 

[Porpoise Hork]

I searched and found a few other brands with the same group and matching case size but all are AGM. This was the only lithium based battery that turned up. Shame it's got shit capacity since it's a perfect fit...

 

[Jmitchelltfo]

I searched and found a few other brands with the same group and matching case size but all are AGM. This was the only lithium based battery that turned up. Shame it's got shit capacity since it's a perfect fit...

Any reason why you want to move away from AGM for the OEM location? I'm interested in what you are trying to accomplish, since your starting battery is an AGM anyway...........unless you plan to replace it too.

I'm not trying to sharpshoot, just looking for insight.

 

[Porpoise Hork]

Really just wanted to retain the extra reserve for the 12v side that the lithium battery provides but regain the lost storage space taken by the additional battery. I guess I could get off my butt and see how much of a PIA it'd be to design a new battery tray that would readily accommodate the larger lithium cells and just 3D print one. Of course I'd need to get an enclosure to print with ABS or have a service do it for me once the prototyping is done.

 

[Jmitchelltfo]

Really just wanted to retain the extra reserve for the 12v side that the lithium battery provides but regain the lost storage space taken by the additional battery. I guess I could get off my butt and see how much of a PIA it'd be to design a new battery tray that would readily accommodate the larger lithium cells and just 3D print one. Of course I'd need to get an enclosure to print with ABS or have a service do it for me once the prototyping is done.

Or, just do a little dremel work and squeeze a 20-30 ah LFP in there. Cheap, effective and double your current aux capacity.......or move to a single battery setup to open up that tiny bit of storage space.


I've kicked this idea around......but my OEM aux running parallel with the 20ah LFP has been great over the past seven months. I don't really see a "need" for it. I do have an extra 30ah LFP that is sitting in the garage. I might give it a shot when I have some spare time.

 

[Porpoise Hork]

I'll take a look at modding the OEM tray this weekend to see what's involved. I may just end up going with the larger AGM battery for the tray since the OEM is 3 years old now and probably getting close to needing replacement. For the piggy back 20AH lithium I have (or might up it to a 30AH) I could design a basic 3D printed cover box for it to hide it better and protect the terminals especially when the seat is up. Can make it to fit up to the 30AH size and use velcro to attach it to the carpet so it won't slide around or rattle.

 

[Snakebitten]

Any reason why you want to move away from AGM for the OEM location? I'm interested in what you are trying to accomplish, since your starting battery is an AGM anyway...........unless you plan to replace it too.

I'm not trying to sharpshoot, just looking for insight.

It could be because a few of us have followed the mad scientist (HammaMan) and swapped our Powerboost Auxiliary battery for an LFP battery.

It's just too tempting to look at the OBDlink dashboard and see 100% SOC

(lower left)

 

[Porpoise Hork]

It could be because a few of us have followed the mad scientist (HammaMan) and swapped our Powerboost Auxiliary battery for an LFP battery.

It's just too tempting to look at the OBDlink dashboard and see 100% SOC

(lower left)

MUST...

KEEP...

SOC...

At...

100%....

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