Seedling Battery

Evolution
It evolves from Seedling. Its advised to not evolve them in the early game, as they don't provide a large enough Mana pool with low genes.

Combat
Since they perform miserably in battle it's recommended to keep them in reserve, especially since they don't even have any abilities to recover their Mana.

Overworld
Their main use is restoring Mana, preferably on the Overworld and not in combat, due to Seedling Batteries sacrificing all their other Stats for Mana.

Breeding
Consider fusing to make them Support Level Types for even more Mana. Don't hesitate to get them traits like Diluted or Lust Bound either, as none of their other Stats will ever amount to anything and they'll stay in reserve.

Moneymaking
They can be sold for 50 gold at Medium size and for 150 gold at Enormous size. Every level above 1 additionally increases their price by 5%.

Trivia

 * One of Druid's special units.