Lithium batteries that are “low” profile

[Flod]

I have 2 ea 140 ah normal lead batteries in my Dufour today. They are toast and I am very tempted to put in lithium batteries instead of buying new leads. I’ve read a lot of the threads and articles about how lithium and think I start to grasp what I need but now my problem is that the battery compartment is very limited in height. It’s 1070x223x240 mm where 223mm plus maybe 20mm for the terminals is the height that have clearance. Rebuilding this or moving the battery bank feels like a to big job. Anyone have any ideas on lithium cells that are wider than they are high? Most smaller cells for example 100ah and 180 ah I found out there are 270-300mm high. I thought about positioning the cells laying down but then the standard connectors (that I understand is kind of vital) doesn’t really fit to put 4+4 cells together. Ideas?

[mbartosch]

Check out the Winston LiYFePO4 cells, there are several options between 90 and 130 Ah that are less than 200 mm high.

[Flod]

Thanks i ended up buying winston cells that where 218mm high.

[john61ct]

Link to source, delivered pricing?

[senormechanico]

john, john, john,
I found this in about 20 seconds on the internet.



Winston Battery is rare earth lithium yttrium power battery.
Winston Battery lithium LiFeYPO4 high power cells. - The Winston Battery products offer high power solutions for all kinds of lithium cell applications.
90AH Winston Battery Cell
Model: WB-LYP90AH
Nominal Capacity: 90AH
Operating Voltage: 2.8V~4.0V
Weight: 3.0kg±50g
Dimensions: 143×61×218(mm)
$113 each





https://winston-battery.en.made-in-c...4-Battery.html

[john61ct]

I am intimately familiar with the batteries themselves thanks, but what I asked for - from @flod - still stands. The point is delivered pricing and sales / distribution channels, ideally based for warranty return purposes in the US.

I prefer to avoid doing the import process myself, especially all the way from China.

But thanks for the kind intentions.

[senormechanico]

While others do just that, but thanks for your concerns.
You were looking for a 29 foot boat a while back, did you ever buy one?
Do you even have a boat, or lithium cells in anything but maybe tool or a phone?
Just asking... (crickets?)

[Flod]

I Bought from Czech republic. 90 dollar ADR freight within the EU. Shipped the same day. I hope to buy these one time in 10 years so I’m not very concerned with saving that last dollar on the price.
https://www.ev-power.eu/Winston-12V-...ing.html?cur=1

[john61ct]

Thanks for that €90 is a cheap delivery cost. But last I tried, they don't ship here, I think most EU vendors don't want the stateside hassles.

And yes in general, trying to get lowest price usually does not get best value, certainly in this niche market.

[senormechanico]

The lack of an answer is, of course my answer.

[barold]

This is my challenge (finding lithium cells at a high enough AH rating that fit into my battery box). Existing batteries are Group 24 batteries (max 240mm) and there is a space aft that would be directly on the hull (vibration issues?) that others have fit an 8D battery but i am concerned about the lack of isolation and protection).

My reason for looking for larger cells is to reduce/eliminate paralleling cells to get to the Ah I am looking for (300)

[KTP]

Maybe check out the group 24 Trojan Trillium 92ah.

Four of those would get you near 300ah

[barold]

Isn't there a problem with paralleling that many Lithium batteries?

[donradcliffe]

Relion advertises an 8D sized 300ahr drop in.

https://relionbattery.com/products/lithium/rb300

Its pricey, and some of their sales literature concerns me. Does anyone have any experience with Relion lithium batteries?

[john61ct]

I strongly advise against any of these drop-ins.

Either build a pack to fit your existing space, or

IMO better, modify your space to fit the cells that are electrically optimal for your needs,

in either case from known-good top quality cells.

Really best to do all paralleling if any, first, at the lowest level. Two strings if desired for easier redundancy.

Even 3 paralleled strings can cause imbalance issues, but there are live-balancing devices that can compensate, but that starts to violate KISS.

Or, just stick with lead, probably the best option for most.