Pet Safe RFA-67D 6-Volt Battery, Economy, 12 Batteries, Pack of 6.

These are great refill batteries for Petsafe collars. Other brands with the same battery ID do not fit the Petsafe dog collar electronic fence. Save money and get the good quality batteries the first time around. I found out the hard way and wasted money on an inferior set of batteries. Now I only buy these.

I need these for the collars on 2 large dogs. I love that I can buy a “lot” at once and have a supply whenever I need them. I have purchased these many times over the years. The only thing i did not like this time is the packaging. They have always come in a box. This time they were just in a plastic sleeve.All in all, they work great.

Good value came on time

If used daily the battery life lasts about 5 months. Very happy value for the money. Highly recommend.

Update: some have asked how long these last. Mine were delivered April 24 and I am just now replacing the batteries in my dogs' collars. That is a full 3 months plus about a week before they started flashing that they needed a new battery.The first time I ordered this product I only received 6 vs 12 batteries. Amazon was quick to offer solutions. The batteries seem to last long than a month but a little less than three. I don't get the feeling of some other reviewers that "I am always changing batteries." They work great.

We recently bought the Pet Safe self contained wireless fencing for our dogs. I inadvertently left the fencing transmitter on which caused the collars to go dead. I searched the web and found that this was the best deal on a bundle of batteries. Therefore, I ordered them with my prime. We replaced the batteries in each of the collars (we have two collars), and both of them are going strong. I'm not sure how long they will last before they will go dead, because this is all new to us. However, so far we are happy with the strength of the batteries so far. If you have one of these systems, I would highly urge you to buy a larger quantity to have them on hand constantly; because if you are depending on this system to keep your dogs safe and in your yard, you sure don't want them to fail you.

Better life than off brand.

I have used these batteries for years for our 2 PetSafe dog collars. I have been very satisfied with everything but the price. I took a chance and decided to buy the off brand batteries. Big mistake!!! The off brand batteries did not fit perfectly so they kept falling out and my dogs were running out of the yard. When the batteries stayed in place, they did not last more than a week. Glad to say that paying a little extra for piece of mind and 3 weeks of reliability is worth while in the end.