I have 2 M300 batteries that would not charge.  I figured they just needed a firmware update.  By the time the update came out, the batteries were completely dead and now the charger won't even recognize them. They are just over a year old and only used about 6 times.  Is there a way to charge the batteries from a completely drained state?

I have 2 M300 batteries that would not charge.  I figured they just needed a firmware update.  By the time the update came out, the batteries were completely dead and now the charger won't even recognize them. They are just over a year old and only used about 6 times.  Is there a way to charge the batteries from a completely drained state?