I'd snatch them all up regardless! Wally-world (WalMart) is now giving $9 per battery trade in! I'm still using 4 old AGM batteries, each with one dead cell, to power all my 9 volt devices. They only put out 10volts, but two of them power everything for a month (3 smoke alarms, a cordless phone/answering machine, and a life-alert system), while the other two are charging.