The Cobra CP8521 cordless phone Battery will solve your battery problems or provide you with a spare battery. The Cobra CP8521 cordless phone Battery comes with a 30 day money back guarantee and a 1 year free replacement warranty. Once we have received your new order for the Cobra CP8521 cordless phone Batteries, it will be processed within 24 hours or on the next business day with Free Shipping via USPS First Class Mail.