Eldritch battery bug

I have Eldritch battery in passive skill tree, the problem is that when i put points into energy shield it did not increase my mana pool it stay in place, but when i refund Eldritch Battery my energy shield grow

If you hover over the word "converts" in the Eldritch Battery description the tooltip states that it only converts base ES to mana. That's why percent increases to ES do not affect the amount converted. It's intentional. It's also why items like ghostwrithe and atziri's disdain are able to still apply energy shield while Eldritch Battery is active.

Example order of operations as intended:.

1. Base ES is converted to mana by Eldritch Battery
2. Ghostwrithe or Atziri's Disdain convert life to ES
3. Everlasting Gaze adds ES based on base mana
4. Percentage increases from skill nodes are then applied to both ES and mana