battery case for 12 volt aquarium backup power supply

Pretty simple. Put battery in box and wire parallel to power source to 12volt dc pumps and power head. Use a 12v battery charger (not the original power supply) to power device and keep battery charged. This should give you 12-24 hours of runtime on a pump running on low speed or a propeller powerhead.

This will ONLY work on a 12v DC drive pump.