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Charging the battery

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Showing 1-8 of 8 posts in this discussion
Initial post: Jul 12, 2013 2:34:40 PM PDT
Cassie Homer says:
I have been told to wait until the battery reached 15% to charge because it decreases the life of the battery to keep charging it when it is not needing charged. Then I am told it does not matter and keep it charged all the time and it has no effect on the battery. Any opinions?

In reply to an earlier post on Jul 12, 2013 2:44:20 PM PDT
JES says:
I charge the battery whenever I feel like it. It doesn't matter when you charge the battery.

In reply to an earlier post on Jul 12, 2013 2:45:13 PM PDT
The Artist says:
That was the case for older rechargeable batteries, but lithium ion batteries don't have to be discharged to a certain point before they can be recharged.

In reply to an earlier post on Jul 12, 2013 3:03:58 PM PDT
Last edited by the author on Jul 12, 2013 3:04:14 PM PDT
Cassie Homer says:
Okay, thanks. One argument I heard was the battery's max charge would decrease because it "remembered" the charge. Good to know it is no longer the case.

Posted on Jul 12, 2013 3:05:26 PM PDT
CBRetriever says:
I usually do it on my Fire at about the 50% level

In reply to an earlier post on Jul 12, 2013 3:14:17 PM PDT
Bixillarla says:
Cassie, that is true with the old style batteries. Lithium Ion batteries do not have the remembered charge issue.

Posted on Jul 12, 2013 3:42:27 PM PDT
Charlie says:
Lithium ion batteries really really do not like being at a low voltage / low state-of-charge. Low SOC will kill a lithium battery quickly, so Amazon, like most other manufacturers go into a low power standby state well before the battery gets to the destructive range. So the only way to kill the battery with low voltage is to run it down to "0%" and then leave it slowly draining additional power for several weeks.

Lithium batteries wear out both by aging and the total number of cycles, or more accurately, the total power delivered. The aging effects are increased by being at a high state-of-charge. For this reason, the Tesla electric car is normally only charged to the 90% of full charge and will charge to the truly full 100% charge if you set it to the "full range" mode.

I have no idea whether Amazon padded the upper voltage limit by 10% or if full charge on a Kindle is truly full charge. In any case, the faster wearout from being a full charge is relatively minor -- something on the order of 2 times faster ... so lifetime to 50% capacity would be something like 4 years instead of 7 years.

This is quite different from discharging a Li-ion battery below the safe lower limit. In the low voltage case, damage is done over a matter of a few days. That's why 0% charge on the Kindle isn't really the lower limit, but is probably 10% or so above that so it can shutdown to a low power state and remain there for weeks before doing damage.

When possible, I run my devices between 30 or 40% on the low side and remove them from charge shortly before reaching 100% --- if I remember.

In reply to an earlier post on Jul 12, 2013 11:24:01 PM PDT
Cassie Homer says:
Great. Does the same apply about charging a bit, taking off the charger and charginig more later? Sorry to sound so stupid about this
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Discussion in:  Kindle forum
Participants:  6
Total posts:  8
Initial post:  Jul 12, 2013
Latest post:  Jul 12, 2013

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