Quote:
Originally Posted by **********
I've had my my Macbook for over 3 years now and I still get about 5 hours use out of its batters (almost 6 if I dim the screen). Tracy's iPad batteries seem to last forever too, and I've never once run out of juice on my iPhone. Maybe making the batteries removable isn't necessary?
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its just a matter of time my friend...
A Standard (Cobalt) Li-ion cell that is full most of the time at 25 °C (77 °F) irreversibly loses approximately 20% capacity per year. Poor ventilation may increase temperatures, further shortening battery life. Loss rates vary by temperature: 6% loss at 0 °C (32 °F), 20% at 25 °C (77 °F), and 35% at 40 °C (104 °F). When stored at 40%?60% charge level, the capacity loss is reduced to 2%, 4%, and 15%, respectively.
If overheated or overcharged, Li-ion batteries may suffer thermal runaway and cell rupture. In extreme cases this can lead to combustion. Deep discharge may short-circuit the cell, in which case recharging would be unsafe.