Adding a 110ah gel battery to an 80 ah gel.

[Pappy]

I'm pretty sure all of the advice I've seen has suggested that an additional battery should be the same as the original.

 

[Pablotti]

Absolutely right. Both batteries should ideally be the same age too. If you’re looking for extra power, It would be best to add two new matching batteries.

 

[Andacami]

For best performance, yes. Age and rating should be the same.

Technically, it's possible to mix and match but I understood the issue to be that the stack of batteries will start to work in tune with oldest, weakest one in the stack.

 

[Pappy]

I'm having various upgrades at the moment and the installer has added a 110ah gel to my 80ah which is a few months old.

 

[Jamesh]

Should be fine I would think?

Same type similar age etc.

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[Jimbohorlicks]

I wouldn't worry about it ,both are the same type of battery ,just run with them.