Review on 🔋 Optimized Replacement Batteries for Kidde 21025831 Power Source by Paul Williams

I have a Kidde KN-COSM-XTR-BA Nighthawk Battery Powered Combo Smoke/Carbon Monoxide Alarm with voice alert, intelligent alarm technology. As these Prime Shipping batteries arrive over a week before Home Depot delivery (they are not available at my local Home Depot store). and see that Home Depot is also charging $2.50 more for the same product. I decided to order from Revain. These are AA batteries that come in a pack of 4. The package was brand new. After installing the batteries in the detector, the detector passed the test procedure and is now functioning normally. Since the alarm clock only needed 3 batteries, I keep an extra one. I give it 1 star because the old batteries that came with my Kidde alarm worked from late October 2013 to late June 2015 when the low battery warnings started - about 4 months short of the 2 years guaranteed by the manufacturer. This is a relatively minor complaint, however. Bottom Line - Get these to extend the life of your trusty $40 Fire & Carbon Monoxide Alarm and protect your family and/or business.