Introduction DIY Invisible Fence battery Invisible Fence pet containment systems require a new battery in the dog's collar every 3 months. Invisible Fence dealers sell battery packs for around $15. This expensive battery is a plastic case around a common CR1/3 lithium cell, readily available from any hardware or drugstore for less than $5.00. Here is how to "renew" your battery in about 1 minute!
	Step 1 Prepare tools and supplies. You will need: - A 3V lithium cell known as CR1/3N or DL1/3N - A spent Invisible Fence battery module - A razor blade, a sharp knife or a very small shovel - Optionally, something to grasp the battery with to avoid cutting off your fingers.
	Step 2 Grasp the battery. Hold the battery sideways and grasp firmly
	Step 3 Pry off the cover With a very sharp knife, separate the cover ring from the battery housing.
	Step 4 Separate the cover Gently work around the battery housing until the cover falls off. Be careful with the metal contacts! Note the orientation of the cell - the new cell will go in just like this.
	Step 5 Pull out the battery assembly Gently pull out the cell by the metal contacts.
	Step 6 Separate the battery Remove the cell from the metal clip. Discard the cell in the most environmentally-friendly way available.
	Step 7 Insert new cell Put the metal clip around the new cell. Make sure the positive side of the battery only (the metal can) is in contact with the metal clip. Gently insert into the plastic housing, aligning the metal clip with the grooves on the inside of the housing.
	Step 8 Check battery and clip positioning Make sure the cell is all the way in and is oriented correctly.
	Step 9 Replace plastic cover It will snap into position between the 2 metal contacts. You are done