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AGM battery question

A

aporschefan

PCGB Member
I don’t drive my ‘91 944t enough and sometimes can go months and months and months without driving it. I do have an isolator switch but forgot to use it last time and, knowing me, I suspect this could happen again. I can’t trickle charge it unfortunately.

So I need replace the battery. The two options I’m currently considering:

1. Bosch S5A11 AGM — 80Ah / 800A / 315mm

2. Bosch S5A13 — 95Ah / 850A / 353mm

I’m fairly sure the S5A11 will fit without issue.

The difference between the original specification (65-75Ah?) and 80Ah is helpful but not significant. The difference between 65-75Ah and 90Ah is , imo, much more significant. I appreciate the 90Ah battery is heavier and larger so it’s not without a trade off.

Has anyone gone as far as fitting the S5A13?

If anyone has done this, did you need a specific bracket? If so, which one?

Are there my other options anyone wants to recommend?

Thanks in advance!
 
Read a little more since the initial post. It looks like the Bosch S5A11 may fit but needs a bracket? And that the second option isn’t really an option.

Is anyone able to recommend a bracket to use with option 1? Is it off the shelf or needs fabrication?
 
I’ve measured and it looks like anything beyond 280/290mm will need a custom tray and addition bracing on top too? Probably too much effort for me. I’d only be interested if there was an off the shelf option but I haven’t found one.

Will probably stick with the standard size.

If I’m wrong about the off the shelf tray, please share a link.
 
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