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What is the life span of a battery?

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Offline alexroddie Reading The Terror by Dan Simmons
15 Dec 2014, 10:20 AM | Post: #11

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RE: What is the life span of a battery?

(14 Dec 2014 04:33 PM)Tim_A Wrote: Wrote:  2 is not so  necessary with newer battery tech as it used to be, but yes you should run them on batteries as much as you can, and drain the battery "a reasonable amount regularly"

I've got one old laptop (~ 5 years) that's effectively mains only cos it was never unplugged. The battery won't hold a charge for more than 15 minutes, and you can't get replacements now.
^^ What Tim said!

Deep discharge cycles (ie. draining all the way then recharging all the way) can actually damage the latest battery technology if done too frequently, but regular charging and discharging is essential for good battery health. 

I have a MacBook Air, and tend to put it on charge when it gets down to 30-40%. It could still run for several more hours, but since this battery is effectively non-replaceable I'm keen to keep it in good condition.

I have destroyed laptop batteries by keeping them plugged in all the time.
Offline mummycool1 Reading I see you by Claire Mackintosh
15 Dec 2014, 01:34 PM | Post: #12

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RE: What is the life span of a battery?

(14 Dec 2014 07:49 PM)Santos Wrote: Wrote:  Battery life span is difficult to predict as there are several factors to it.
Most batteries on portable devices will be of the Lithium family. There are several types available but the names wouldn't mean much to most people. Suffice it to say that 'not all batteries are created equal'.

In general, batteries, like most things, degrade with age (regardless of whether or not they are used) and operating in environments that are too hot or cold can cause them to die faster.
Over time the amount of charge the battery can hold will degrade, and keeping a battery charged can be as bad as running it into the ground (the former causing the battery to develop a memory effect and the latter causing damage to the internal cells due to deep discharge)

If i had to guesstimate then i would say that the average life expectancy of a battery is somewhere around the 5 to 10 year mark.
But that is assuming optimal conditions, and that the device using the battery was properly designed. Nothing kills a battery faster then a device that sucks more energy out of a battery than it can safely supply over a prolonged period of time.


The good news is that if your gadget was well designed (and most kindles fall into that category) then you should be able to get a decent lifespan out of the thing.
The bad news is that if your gadget was not well designed then ... well... let’s just say that I've heard more than one horror story about exploding lithium ion batteries and crappy chargers. Smile

Thanks Santos, very interesting reading and most helpful.

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Offline George Reading In The Blood Steve Robinson
15 Dec 2014, 04:46 PM | Post: #13

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RE: What is the life span of a battery?

I thought I read somewhere that it was good to run down the battery to zero every now and again, but having read the last two posts perhaps that is not such a good idea. Ive been changing fire HDX every couple of days for the last 2 years once it has gone below the 15% marker at it is still running fine.
George
Offline alexroddie Reading The Terror by Dan Simmons
15 Dec 2014, 05:08 PM | Post: #14

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RE: What is the life span of a battery?

(15 Dec 2014 04:46 PM)George Wrote: Wrote:  I thought I read somewhere that it was good to run down the battery to zero every now and again, but having read the last two posts perhaps that is not such a good idea. Ive been changing fire HDX every couple of days for the last 2 years once it has gone below the 15% marker at it is still running fine.
George
Doing this occasionally won't harm it, but deep discharge cycles several times a week (for example) can do damage. It isn't essential for battery health as it used to be ten or fifteen years ago.
Offline mummycool1 Reading I see you by Claire Mackintosh
15 Dec 2014, 05:10 PM | Post: #15

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RE: What is the life span of a battery?

That's usually what I do, charge when it gets to around 15-20%
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Offline Kevin Chilvers Reading Goliath - Richard Turner
19 Dec 2014, 10:29 PM | Post: #16

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RE: What is the life span of a battery?

(15 Dec 2014 01:34 PM)mummycool1 Wrote: Wrote:  
(14 Dec 2014 07:49 PM)Santos Wrote: Wrote:  Battery life span is difficult to predict as there are several factors to it.
Most batteries on portable devices will be of the Lithium family. There are several types available but the names wouldn't mean much to most people. Suffice it to say that 'not all batteries are created equal'.

In general, batteries, like most things, degrade with age (regardless of whether or not they are used) and operating in environments that are too hot or cold can cause them to die faster.
Over time the amount of charge the battery can hold will degrade, and keeping a battery charged can be as bad as running it into the ground (the former causing the battery to develop a memory effect and the latter causing damage to the internal cells due to deep discharge)

If i had to guesstimate then i would say that the average life expectancy of a battery is somewhere around the 5 to 10 year mark.
But that is assuming optimal conditions, and that the device using the battery was properly designed. Nothing kills a battery faster then a device that sucks more energy out of a battery than it can safely supply over a prolonged period of time.


The good news is that if your gadget was well designed (and most kindles fall into that category) then you should be able to get a decent lifespan out of the thing.
The bad news is that if your gadget was not well designed then ... well... let’s just say that I've heard more than one horror story about exploding lithium ion batteries and crappy chargers. Smile

Thanks Santos, very interesting reading and most helpful.

[url=//www.pinterest.com/pin/create/extension/][/url]
lithium Ion batteries do not suffer from memory problems and can accept deeper discharges and faster charging rates. They can be left partially charged for a period of time without suffering damage - in fact if they are not being used for a while it is recommended that they be 50% discharge and removed from the device. most Li-Ion batteries have a life of approximately 1000 charge / discharge cycles but this is based on deep discharge to about 20%. less discharge will prolong battery life - but no indefinitely. With average use a good Li-ion battery will probably last about 5 years but as stated high temperature, damp conditions etc will decrease it. Charge a battery as soon as possible after discharge to improve life unless you are storing it and expect to buy a replacement battery every so often. Even if the original isn't available alternatives often are, and due to improved technology they are often better. Also use the correct charger as charging too quickly or too slowly is bad for the battery. 
hope this helps - PS I was an electronics engineer in the RN for 17 years and now live on a boat where batteries are important.
all the Best
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Offline Santos Reading
21 Dec 2014, 11:25 PM | Post: #17

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RE: What is the life span of a battery?

This post was last modified: 21 Dec 2014 11:26 PM by Santos.
In retrospect my post does appear a bit misleading.
Indeed Lithium Ion batteries do not suffer from memory effect, that portion of my post refers to Nickel Cadmium and Nickel Metal hydride (neither of which are used in Kindle’s to my knowledge but are often used in plenty of other devices... well, Ni-MH anyway, NiCd went the way of the dodo some time ago)

And i wouldn't worry too much about being afraid to cause damage to your kindle by occasionally discharging the battery to 0
While I'm not aware of the internal workings of the Kindle, it is safe to assume that the people that designed it added in a safety cut off that shuts the unit down before you can inadvertently deep discharge the battery. The battery will be drained, true, but not actually deep discharged (as in it should not have taken any damage).
It doesn’t benefit a company if their product dies on you... at least not before they have a shiny new one that they want to flog Wink , so they will add in safeties to make sure you can't accidentally damage critical components.
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