LM-High Tech Pet Humane Contain Electronic Fence Collar Battery 2 Pack High Tech Pet B-3V8 Radio Collar Battery Packs provide long-lasting power for your RC7 and RC8 electronic dog fence. Fresh batteries allow the remote collar to provide strong stimulus for effective training. Note: this battery is disposable and not rechargeable. Replacement battery packs for RC7 & RC8 Radio Collars Powerful & long-lasting for effective stimulus Easy to replace Typical battery life is 2-4 weeks