Cool Cells: Enclosures for Batteries & Electronics

COOL CELLS® are highly insulated, passively cooled, outdoor enclosures that protect and prolong the life of batteries and low-power electronic equipment.  This is accomplished via an internal water reservoir, connected to the radiator lid of the enclosure that is recharged with cool water each night, in summer*. Cooled water modifies temperature fluctuations, thus protecting against  both high and low temperature extremes. This, in turn, preserves the  life of the battery and ensures the reliability of sensitive electronic  equipment.  *In winter, ice in the reservoir prevents warm water from convecting to the radiator.  



1.  Cool Cells use NO electricity.

2.  Cool Cells have NO moving parts, other than pure water.

3.  Cool Cells require NO scheduled maintenance.


  • 14-gauge, galvannealed steel
  • White acrylic enamel paint
  • Hinged-front door with lockable latch
  • Cool Cell® cooling system
  • H2Vent ™ Passive Hydrogen Ventilating System
  • 2″ Styrofoam R-10, with weather strip insulation
  • Pad mounting with bolt-down at corners (optional pole mounting)
  • 2″ conduit access
  • Ability to conform to NEMA 3R      

How do they perform?

CC Performance Graphs (pdf)


At night in summer, warmed water convects to the enclosure’s radiator lid; it then cools and returns to the reservoir below. This action  recharges the reservoir, and the enclosure is ready for another day of  heat. In the winter, during freezing weather, this same reservoir of  water releases 144 BTUs per pound as it freezes – enough heat to guard  the enclosure from sub-freezing temperatures for several days in most  climates. 

        ***Cool Cells must have full view of the night sky to function properly.***


Cool Cells: The Basics

Standby Battery Cool Cell

Our most common enclosures. The cool water in the internal reservoir  cools the air which, in turn, cools the batteries. The batteries in this  Cool Cell must be charged to take over when electric power fails.

Cool Cell for Electronics

This Cool Cell enclosure houses electronics.  Electronics give off heat and thus need not only air cooling but  also sometimes direct cooling via a cold plate attached to the plenum. 

Cycled Battery Cool Cell

Batteries that cycle daily must dissipate considerable heat. The Cool Cell water reservoir touches the batteries directly for greater cooling efficiency, as opposed to cooling the air to cool the battery.  COOL CELLS® cooled enclosures are a battery saver as they extend battery life.

Want to know more about Cool Cell Models and functions?

Click the button below to see a few of the most popular sizes and models. We have too many to list them all. If you don’t see what you need, please contact us  for more options. 

Battery Boxes


Zomeworks Battery Boxes set themselves apart due to their fine design and attention to detail and workmanship.  Battery Boxes are similar to the Cool Cell, but without the insulation and water reservoir.

  • 14-gauge, galvannealed steel
  • White acrylic enamel paint
  • Patented H2Vent™ system
  • Custom designs available

H2Vent™ Hydrogen Venting

 Passive Hydrogen Ventilating System