I recently replaced my laptop battery. The old battery lasts only 20 mins even with minimum usage. Even if fully charged, the battery level reported by Windows XP is only 91% and can never get to 100% (why?). If the charger is removed, e.g. during discharging, the battery level slowly decreases at a rate of 1%/1min until around 60-70% where the battery level suddenly drops to 3%, resulting in a 'Critical Battery' warning. At this time, the laptop attempts (unsucessfully) to go to standby mode but before it can ever get to standby mode, the battery drains and the notebook turns off.
I am amazed by the sudden drop of the battery level. I wonder how the battery level is measured, is it by Windows or is it by the battery circuit? What are the factors used to measure the battery level, e.g. voltage/current? I am not sure what formula was used that can cause such a sudden drop in the battery level. Strangely the estimated battery life reported by Windows is accurate - it reports around 20-30 mins right from the beginning. Any ideas?
Btw, my new battery can last for around 3hrs with average usage.
I am amazed by the sudden drop of the battery level. I wonder how the battery level is measured, is it by Windows or is it by the battery circuit? What are the factors used to measure the battery level, e.g. voltage/current? I am not sure what formula was used that can cause such a sudden drop in the battery level. Strangely the estimated battery life reported by Windows is accurate - it reports around 20-30 mins right from the beginning. Any ideas?
Btw, my new battery can last for around 3hrs with average usage.