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They are not design to go upside down, but they can. One thing is to watch he temperature. If they over heat they can blow out. Have changed many UPS batteries in my time and they usually blow out. The last one I had the drill out the pop rivits on the frame the get the old ones out.
They have no maintenance but still need to be monitored. GEL is only a GEL when the temperature is low, Once the temperature get to high the GEL becomes a liquid and if you are running closed vent GEL batteries they blow out fortunately not blow up.
If you use vented GEL batteries which are nearly phased out they can leak. These have ever so tiny holes in the top where the terminals are to vent the bettery when the GEL gets a bit hot.
They also Sulphate the same as any other battery so they need contact charge and discharge.
I haven't used deep discharge/cycle batteries for a long time so not sure what is out there.
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