For those looking for a low-maintainance breeder design:
The design heats itself up 57k heat and hovers there reguardless of whether it is dormant or actively recharging.
It can charge upto 4 cells in roughly 8 minutes 40 seconds.
Be warned though, while 57k is just below the stone melting temp. it is still high enough to hurt, so interact with it at maximum range.