"No memory effect" means you can have a backup battery without a separate charger.
I suggest buying 4 headphone batteries and using two at a time with these simple rules.<br />1. Always switch off when taking off.<br />2. Always recharge overnight whichever batter is in the headphone at the end of the day.<br />3. During the day, whenever the headphone will probably not be used for 2 or more hours--switch batteries and recharge. (Or--you might also switch-and-recharge in the middle of the night or early in the morning.)<br />4. Any time that a battery starts to conk out after only a few hours use--it is on the way out. So it is then time to enter a third battery into the switch-off routine.<br /><br />Thus--even if you usually use the headphones all day long--you will always have two almost-fully charged batteries--or the equivalent--to get you through the day.  This should work even if there is only one or two days weekly that you are able to switch batteries and partially recharge for a couple of hours during the day.<br /><br />Note. Our Sony headphone must be switched off during recharging. Also it seems that perhaps the sound input to the TV needs to be plugged in during recharghing, although I am not yet sure about this.<br /><br />I have not yet used these 'aftermarket' batteries for very long. However, so far so good. The original Sony batteries conked out after two weeks. It seems likely these others cannot be worse, at least.<br /><br />I intend to update this review after several months of intense battery usage. So y'all be sure to come back again, hear?
Rating: 5 stars