For the n800 ...I think in all my years I had to delegate 1 battery to "always plugged in " state for the studio...since it finally got to a fully charged level of only under 2 hours. Other than that one battery (which was the original I got +7yrs ago and used every day since)...all the rest of my bp-5l batts are perfectly fine...had them more than 5 years and all show 7 hours. I do heartily suggest if you have batt consumption issues with the n800 . 1- get proper OFFICIAL OEM bp-5l batts. 2- install cssu, asui, and diablo turbo 3- tweak your power settings there is no reason you can't have 7hours active/ 10days standby. As a side note.... I sure wouldn't mind (and I'm sure others as well) having permanent power by wiring and bypass the need for a battery. Perhaps a cash bounty $$$ would be good incentive to seeing movement and getting it done.(If it can be done... that is...some serious wizardry will be involved for sure....power fluctuation, surges etc...will be an issue for a start...the device wasn't really built for direct wiring ....)