This battery is supposed to hold a charge for 10-14 days. The best I could get it to do was hold a charge for 2 days. This is unacceptable. I sent mine back to Radio Shack for a full refund. Also, the battery is a bit on the expensive side, especially for such poor performance. I would not buy one again, and if I did, I would be ready to test it and send it back within 30 days of purchase if it doesn't work again.