Honey XP

Usage
Make the following contraption using a lightning rod and a lapis block:

Now with honey bottles in your hand, right click the lightning rod. A small amount (minimum of 7 xp) will be transferred into the honey bottle:

You can keep right clicking the honey bottles on the rod. The XP per click will increase until the honey is fully saturated. In total a single honey bottle can contain up to 427 xp which comes down to about 17 levels when counting from 0 levels.