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Old 08-01-2012, 01:25 AM   #1
zhddz
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Battery Life

I think for lithium battery, I can only charge it for certain number of times.
That's why I saw many people recommended to fully charge the battery every time.

But every time I transfer data through USB, the reader charges itself at the same time. I think the reader doesn't know whether I am transfering data or I am charging the battery. Will transfering data affect my battery life significantly? Should I wait the battery to be fully charged every time transfering data? To prolong my battery life, maybe I should use Wifi to transfer data?

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Old 08-01-2012, 02:15 AM   #2
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Quote:
Originally Posted by zhddz View Post
I think for lithium battery, I can only charge it for certain number of times.
That's why I saw many people recommended to fully charge the battery every time.

But every time I transfer data through USB, the reader charges itself at the same time. I think the reader doesn't know whether I am transfering data or I am charging the battery. Will transfering data affect my battery life significantly? Should I wait the battery to be fully charged every time transfering data? To prolong my battery life, maybe I should use Wifi to transfer data?
No.

When the number of charge cycles are quoted for the life of a battery those are full cycle equivalents. For example, two depletions of the battery to 50% charge and recharging to 100% counts as 1 cycle.There may be minor other considerations, but for Li-ion batteries in the likes of a reader or phone they are of no significant consequence.

In the case of Li-ion (and Li-polymer which are the same chemistry) in consumer devices they are also usually protected against full depletion of charge in use (the device turns off before the battery is fully depleted), and always protected against overcharging (overcharging, mainly because of the risk of precipitating metallic lithium which is unstable) so there is no issue there. Rate of charge is also a non issue and contrary to some ill informed advice one sees a slow charge is, if anything, likely to be more beneficial than a fast charge - so charging via a PC's USB port at less than the battery maximum absorption rate may be better than using a higher capacity corded charger which charges faster.
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Old 08-01-2012, 06:41 PM   #3
zhddz
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Thank you for your response, AnotherCat.
From your information, it seems that I can charge my reader whenever I want. That's good news.
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Old 08-01-2012, 06:42 PM   #4
zhddz
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For Sony PRS-T1, there is no way to change batteries, once the battery die, I have to replace the reader, is that right?
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Old 08-02-2012, 12:08 AM   #5
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Originally Posted by zhddz View Post
For Sony PRS-T1, there is no way to change batteries, once the battery die, I have to replace the reader, is that right?
The battery is not intended to be user replacable, but can be replaced by a service centre, or by yourself if you know enough about unclipping the case open and what you are doing to do so.

The battery is connected inside by 3 wires which have to be soldered to the motherboard if you do it yourself. Doing it oneself would, I expect, invalidate the warranty if that was still in effect.

That said I would think that the battery, unless some problem with it, may last the life of the reader (within reason) if it is similar to other consumer items with the battery not user replacable.
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Old 08-03-2012, 06:17 PM   #6
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Quote:
Originally Posted by AnotherCat View Post
The battery is not intended to be user replacable, but can be replaced by a service centre, or by yourself if you know enough about unclipping the case open and what you are doing to do so.

The battery is connected inside by 3 wires which have to be soldered to the motherboard if you do it yourself. Doing it oneself would, I expect, invalidate the warranty if that was still in effect.

That said I would think that the battery, unless some problem with it, may last the life of the reader (within reason) if it is similar to other consumer items with the battery not user replacable.
I agree - but don't continually shut-down or allow battery to run right down a lot.
Both these affect battery lifespan. Only hut down if not going to use for a couple of weeks plus.
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