Subject: Battery advice for LG45

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I need some help in choosing batteries (6 volt) for an LG45.
My understanding of what I need are virtually zero. Ah rating seems to be the the measure of output. What sort of figure do I need to look for. Size is a restriction but I can cope with that. . . .
I have found batteries with 71Ah and 85Ah that would fit (the 85Ah is a bit tight). Anything else I need to take into account?
Any help appreciated.
David