I bought Sanyo 2700 mAh back about 4 months ago. For the last week I have noticed they were slowly going down hill. I had them on my charger for 16 hours over night and got 35 min of use. Very disappointing, I read a lot of forums here on this battery type. All sounded good. Oh well....So I had my wife go and pick me up some Energizers. 2400mAh, I have had good luck with them in the past. Not sure what happen to my Sanyo 2700 mah.