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The appropriate measure of capacity would be watt-hours, not milliamp hours. IIRC the MacBook Pro has a 3 cell battery, meaning that you'll get around ~76Wh fr
by kogepathic 10y ago
The appropriate measure of capacity would be watt-hours, not milliamp hours.
IIRC the MacBook Pro has a 3 cell battery, meaning that you'll get around ~76Wh from the battery (11.2V * 6800mAh).
It's not safe to assume that all laptops will have a 3 cell battery. They might have chosen to install a 2 cell battery, in which case the capacity would only be ~50Wh (7.4V * 6800mAh). That's 35% less capacity!
- JustSomeNobody 10y agoTrue. But is anyone shipping laptop with a Voltage that low? I see them up around 10.8 - 11.1.
- kogepathic 10y agoI don't know about laptops, but I would expect a lot of these "2 in 1" devices to ship with a 1 or 2 cell battery. Tablets frequently have lower voltage batteries. The iPad 4 for example has 3 cells but they're all in parallel, so the voltage is only 4.2V. For laptops the sweet spot seems to be 3 cells, and I'm not entirely sure why, apart from higher voltages requiring smaller traces/wires. Maybe due to the LCD backlight? The LCD from the iPad 4 actually requires ~12V for the backlight, so there's a buck boost converter somewhere on the iPad logic board for this.