9V has been the battery of choice for smoke alarms for many years. However, nowadays, a more common smoke detector battery is two or three AA's. AA batteries have about three times as much energy as a 9V.
Return & Warranty Policy
We accept returns within 30 days of your purchase. Items must be in their original condition with tags and packaging intact. To initiate a return, please contact our customer support. Refunds will be processed within 7 business days of receiving the returned item. Shipping costs are non-refundable.