Throw It In The Fire, See If It Explodes...Ah, Better Not
You can fully recharge a depleted 9v alkaline battery at 63mA overnight without problems. You can fully recharge a depleted alkaline AA battery all day without problems. I recharged both types of batteries twice, and I would expect them to easily take many more charges. If you care about safety more than I do, attach a multimeter to the batteries and monitor them so they never reach more than 110% of their rated voltage.
Blog MyyyyyAsssss thinks it will pass on this one, but it's up to you if you wanna try this.
