Small sized Lithium batteries

[mep1811]

I've been seeing the smaller size lithium 100 Ah batteries available. My question does the Gp 24 100Ah battery have the same capacity as a Gp 27 100 Ah battery? What is the difference other than the size?

Thanks

 

[dstefan]

I've been seeing the smaller size lithium 100 Ah batteries available. My question does the Gp 24 100Ah battery have the same capacity as a Gp 27 100 Ah battery? What is the difference other than the size?

Thanks

There can be all sorts of differences: case construction/durability, cell types (prizm vs pouch), BMS (battery management systems) setup an quality, terminal structures and durability, etc. etc.

@Dave in AZ has some posts here looking at some of the small batteries — you can search for those. If you’re in the market and/or learning about LiFePo batteries you should look at Will Prowes’s website and YouTube reviews and teardowns. He’s very good and pulls no punches.

 

[mep1811]

Thanks

 

[Dave in AZ]

I've been seeing the smaller size lithium 100 Ah batteries available. My question does the Gp 24 100Ah battery have the same capacity as a Gp 27 100 Ah battery? What is the difference other than the size?

Thanks

Yes they bith have same capacity. Well, if same voltage. Capacity is better expressed in Watt-hrs, not Ah, because Ah depends on what the voltage is which folks always forget to include.
100Ah of 12.8V battery is 1280 Watt-hrs.

Like @dstefan said, it is cell size, case size. These case sizes were lead acid based, where larger size was needed to hold larger lead plates. LFP batteries have tons of empty wasted space in some of those cases, but they use them because they are standardized sizes that cars are built to hold. And RVs. People didn't want to buy batteries that would flop around loose.

Lately the 100Ah LFP mini are shrinking cases to have no empty space and some use pouch cells that use less space. I love them. My 100Ah 12.8V redodo weighs 19 lbs!!
Great for truck camping. I wouldn't buy a grp24 or 27 size myself, but I am just shoving a loose battery in a corner, not fitting a pre-built RV electrical storage spot.

 

[rruff]

What is the difference other than the size?

Basically the bigger ones had lots of space that was stuffed with foam.

I bought one of these about 6 months back and it seems legit. BT is great for checking that the cells are balancing properly and working as designed. It's only $150 shipped now on Amazon, almost free.

Elefast 12V 100Ah Bluetooth LiFePO4 Lithium Battery​

 

[mep1811]

Yes they bith have same capacity. Well, if same voltage. Capacity is better expressed in Watt-hrs, not Ah, because Ah depends on what the voltage is which folks always forget to include.
100Ah of 12.8V battery is 1280 Watt-hrs.

Like @dstefan said, it is cell size, case size. These case sizes were lead acid based, where larger size was needed to hold larger lead plates. LFP batteries have tons of empty wasted space in some of those cases, but they use them because they are standardized sizes that cars are built to hold. And RVs. People didn't want to buy batteries that would flop around loose.

Lately the 100Ah LFP mini are shrinking cases to have no empty space and some use pouch cells that use less space. I love them. My 100Ah 12.8V redodo weighs 19 lbs!!
Great for truck camping. I wouldn't buy a grp24 or 27 size myself, but I am just shoving a loose battery in a corner, not fitting a pre-built RV electrical storage spot.

Thanks. It is easy to fit a smaller battery in a larger space with the right hold downs. Looks like I can get two Gp24 lithium batteries in the space of one Gp 27 in my trailer.