Is it ok to position SLA (sealed lead acid) / VRLA (valve-regulated lead acid) batteries upside down?
Are there safety, performance, or longevity implications?
Some UPS (uninterruptible power supply) units take multiple SLA/VRLA batteries, where some may be upside down. For example, the CyberPower CP1500PFCLCD takes two batteries with one right-side up, and another upside down:
However, manufacturers of batteries state the battery can be positioned vertically or horizontally or sideways, but there is no mention of upside down:
With isolated seal, it is not limited to direction, position in place. It can be put in horizontal way, vertical way and side way, its safely and functions totally will not be affected.
Some vendors exclude upside down:
safe operation in any position except inverted