Disposable, long life lithium battery 6-pack provides lasting power to your Blue fang BF-16 and BF-22 electronic dog collar. Patent pending design allows this battery to supply both 3 and 6 volts to the collar simultaneously. Note: Use only genuine High Tech Pet batteries. Damage caused by off-label batteries will void the original product warranty. <br> <br>PLEASE NOTE: Because unauthorized resellers of High Tech Pet Products cannot be made to adhere to the stringent guidelines that our company sets forth to protect the ongoing quality of our branded items, High Tech Pet Products transfers any New Product Warranties ONLY to authorized resellers of our products. In order to assure that you are receiving any New Product Warranty that may be offered or implied, before clicking the "Add to Cart" button, make sure you are buying from High Tech Pet Factory Direct or an authorized reseller of our products.