PDC
03-18-2006, 10:09 AM
Hi!
Just a reminder if somebody should have forgotten ;-).
In the table below you can see that the most important thing is to store the cells around 40% charge level, as the yearly permanent loss will only be 4% at 25 deg C which is hotter than normal indoor temperature.
At 100% charge level and the same temperature the permanent loss will be 20% a year.
No wonder that a laptop battery don't last too long, as it is stored under the worst possible conditions, always very hot, and always fully charged.
So remember one figure 40%, always.
http://www.rc-unionen.dk/nytforum/uploads/TORBEN%20RASMUSSEN/200431812580_parttwo-34.gif
Just a reminder if somebody should have forgotten ;-).
In the table below you can see that the most important thing is to store the cells around 40% charge level, as the yearly permanent loss will only be 4% at 25 deg C which is hotter than normal indoor temperature.
At 100% charge level and the same temperature the permanent loss will be 20% a year.
No wonder that a laptop battery don't last too long, as it is stored under the worst possible conditions, always very hot, and always fully charged.
So remember one figure 40%, always.
http://www.rc-unionen.dk/nytforum/uploads/TORBEN%20RASMUSSEN/200431812580_parttwo-34.gif