In principle, VRLA AGM and Gel batteries may be mounted in any position (except upside down).
This is thanks to the leak-proof nature of such batteries.
By design, the position in which the batteries are mounted has no effect on their service life.
The same applies to lithium batteries.
Wet / NiCad batteries should be mounted upright at all times, otherwise there is a risk of battery acid leakage.

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