[Duncan Macdonald]

Originally Posted by chris1592

On the other hand, it never says you CAN use more than 1 robot battery.

If it doesn't explicitly say you are allowed to use more than one robot battery in any case (whether for power purposes or not), then it is safe to assume it is not legal.

The manual does not tell you what you can do. That's why in the Q&A system there are a bunch of "We cannot comment on specific designs." responses to "Can we use a 3/8" bolt for an axle?".