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ZenBook on AC: Battery Still Supplying Power?
The Real Question: Am I extending my battery's lifetime by running on AC
whenever possible, or is it the same as running the battery down and re-charging? i.e. When running on AC, is the battery still supplying power and just being re-charged on-the-fly? Or is the ZenBook smart enough to take it's power from the AC source and leave the battery for when it's needed? -- Pete Cresswell |
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ZenBook on AC: Battery Still Supplying Power?
(PeteCresswell) wrote:
The Real Question: Am I extending my battery's lifetime by running on AC whenever possible, or is it the same as running the battery down and re-charging? i.e. When running on AC, is the battery still supplying power and just being re-charged on-the-fly? Or is the ZenBook smart enough to take it's power from the AC source and leave the battery for when it's needed? In general terms, if the battery is below 100%, it looks like this. AC ---- adapter ----C---- computer current | v battery When the battery is full, the circuit switches like this. AC ---- adapter ----C---- computer current x battery You're not allowed to trickle charge lithium, which is why it is disconnected when full. With the adapter unplugged, it looks like this. Now the battery provides current. ----C---- computer current ^ | battery If you run the battery to "0% charge" point, the circuit looks like this. ----C---- computer current x battery Some charge must be left on the battery, to prevent conductive whiskers from growing. The charge controller should not discharge the battery pack, below the knee voltage. You get a shutdown warning, only moments before the hardware takes action. So there are two thresholds, a "warning" threshold that sends an interrupt to the processor, as well as a "hardware disconnect" that makes sure the user follows the rules. If the battery voltage drops below the knee voltage, the adapter is not allowed to charge the battery. And this is yet another safety policy. The battery in that case, appears to be "dead". Whereas, it's just below the knee voltage, and the charge controller leaves it disconnected. If you force some current into it in this state, then all the risks are on your head. And this should tell you *not* to store the lithium battery for long periods of time at 0% charge. Because it will self-discharge below the knee and become "dead". If you intend to leave lithium for long periods of time, leave it at 60-70% charge, and verify charge once a year. AC ---- adapter ----C---- computer current x battery (below knee, effectively dead) HTH, Paul |
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ZenBook on AC: Battery Still Supplying Power?
On Sat, 27 Sep 2014 09:16:15 -0400, "(PeteCresswell)"
wrote: Per Paul: In general terms, if the battery is below 100%, it looks like this. AC ---- adapter ----C---- computer current | v battery When the battery is full, the circuit switches like this. AC ---- adapter ----C---- computer current x battery Thanks. That's what I was hoping to hear: if I make a habit out of running the Zenbook on AC, not only will it not damage the battery - it will probably extend it's life due to fewer charge-discharge cycles. However.... I've read that you shouldn't "partially" discharge lithiums, that is, run a short time on battery then recharge. There's a chance you'll do that is you take it off the line occasionally. This concers me because what you're intending is exactly the way I like to use my laptop. |
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