![]() |
#1 |
Enthusiast
![]() Posts: 34
Karma: 10
Join Date: Dec 2020
Device: Clara HD
|
![]()
Hi there,
My Clara HD runs out of battery at 46%. Without warning, when the battery level gets to 46% the device immediately turns off. I am unable to turn it back on or reset it. If I connect the power cable, the device comes back on after a minute or two. If the battery level then says, for example, 48%, once it gets to 46% it will shut off again. My Clara HD is 3 years old. Software 4.38 (up to date) Does the mean the battery needs replacing? 3 years seems like a short lifetime for a device battery, is this normal? |
![]() |
![]() |
![]() |
#2 |
Wizard
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 1,343
Karma: 16297052
Join Date: Sep 2022
Device: Kobo Libra 2
|
How often does this happen? Kobo has notoriously inaccurate battery meters. If the device shuts off and then says 48% the moment you plug it in, the meter is definitely not calibrated properly. Charge it for a few hours and see if the meter drops properly when you start from 100% full.
|
![]() |
![]() |
Advert | |
|
![]() |
#3 |
Enthusiast
![]() Posts: 34
Karma: 10
Join Date: Dec 2020
Device: Clara HD
|
I cant say how often, really its just started but I do remember finding it had gone dead at other times when there seemed to be plenty charge. It could well be the metre as you say.
Ill give what you suggest a try & report back. |
![]() |
![]() |
![]() |
#4 | |
eReader Wrangler
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 7,729
Karma: 50234151
Join Date: Mar 2013
Location: Boise, ID
Device: PB HD3, GL3, Tolino Vision 4, Voyage, Clara HD
|
Quote:
https://batteryint.com/products/3-7v...91ca47ea&_ss=r I don't know where these ship from, or what the cost is for the shipping. |
|
![]() |
![]() |
![]() |
#5 | |
Enthusiast
![]() Posts: 34
Karma: 10
Join Date: Dec 2020
Device: Clara HD
|
Quote:
- I charged it fully after your comment. - I used the Clara HD each evening & the battery went slowly down. - a few days ago it was on 52% & I thought "well it'll get down to 46% soon & ill see what happens." - I didnt pay specific attention, but 2 evenings later the Kobo suddenly shut off. - I immediately connected it to USB charge & when it booted up it said 9% battery. So this time it seems a little different with the battery readings, but similar in that close after 50% it shut off. Does this seem like a battery replacement issue? |
|
![]() |
![]() |
Advert | |
|
![]() |
#6 |
Out of order
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 601
Karma: 1652684
Join Date: Feb 2014
Device: Libra Colour
|
One good thing with the new Kobo is the repair kit from iFixIt.
Not sure if you could replace the battery in this Clara? |
![]() |
![]() |
![]() |
#7 | |
Wizard
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 1,343
Karma: 16297052
Join Date: Sep 2022
Device: Kobo Libra 2
|
Quote:
My Libra did the same thing when it was brand new; I had to do this process 2 or 3 times before the battery meter started reporting semi-accurate values. (My Libra would suddenly shut off at around 30%, rather than your 50%.) |
|
![]() |
![]() |
![]() |
#8 |
Enthusiast
![]() Posts: 34
Karma: 10
Join Date: Dec 2020
Device: Clara HD
|
Thanks. OK, ill give this a try.
Mine isn't new though, its 3 years old & this problem is more recent. When I bought it the battery metre seemed to work normally 100-0% I use it everyday, but only for a short time 30-60 mins & I have the backlight on very low (8%) It used to last 3-4 months. Now just 1 month. |
![]() |
![]() |
![]() |
#9 |
Wizard
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 1,343
Karma: 16297052
Join Date: Sep 2022
Device: Kobo Libra 2
|
Yes, the purpose of calibrating the meter is to get an accurate idea of how much charge you have left and how long you can go on a single charge.
My guess is you've been charging to 100% and leaving it there for long periods since you don't read very much, and that's caused the battery to degrade. Once the meter is calibrated and you have a better idea of how long the battery will last in its current state, you can decide whether you want to continue as is, replace the battery, or replace the device. |
![]() |
![]() |
![]() |
#10 |
Enthusiast
![]() Posts: 34
Karma: 10
Join Date: Dec 2020
Device: Clara HD
|
I use the reader every day, without fail, for about 1 hr. I never leave it connected to USB when charging is complete & I only charge if I notice it is low. I also always make sure I put it to sleep when finished using.
|
![]() |
![]() |
![]() |
#11 |
the rook, bossing Never.
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 12,241
Karma: 89531599
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
|
Leaving any LiPoly cell based gadget made in maybe last 15 years connected doesn't degrade the battery. The built in charge management stops charging it or it would go on fire.
|
![]() |
![]() |
![]() |
#12 | |
Resident Curmudgeon
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 75,719
Karma: 134319572
Join Date: Nov 2006
Location: Roslindale, Massachusetts
Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3
|
Quote:
|
|
![]() |
![]() |
![]() |
#13 | |
Wizard
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 1,343
Karma: 16297052
Join Date: Sep 2022
Device: Kobo Libra 2
|
Quote:
The capacity decline RodRiquez has described over the last three years is exactly what you'd expect from putting the battery through full cycles. The purpose of calibrating the meter is to see just how much the capacity has declined. Current evidence suggests > 50% decline, but since an e-reader uses little power, the Clara may still be usable with a degraded battery -- provided the meter will provide accurate numbers to indicate when the Clara needs charging. |
|
![]() |
![]() |
![]() |
#14 | |
eReader Wrangler
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 7,729
Karma: 50234151
Join Date: Mar 2013
Location: Boise, ID
Device: PB HD3, GL3, Tolino Vision 4, Voyage, Clara HD
|
Quote:
https://batteryint.com/products/3-7v...91ca47ea&_ss=r ...advertises a Clara battery for $19.60 plus $5 shipping (located in the U.S. with 5-7 day shipping), so about $25. It looks like it also comes with tools for opening the Clara. (I count vouch for the seller, I've never dealt with them.) If you're basically only using the Clara once a day, I would consider keeping the Clara completely turned off when not in use. Also, I would disable the WiFi except when you need it (if you aren't already doing that). I think that's why the Sony batteries last so long, they automatically turn completely off after so many hours. Good luck. Sorry your Clara is giving you trouble, but I've noticed that laptop batteries tend to die at about the 40% mark when they need to be replaced. |
|
![]() |
![]() |
![]() |
#15 | |
the rook, bossing Never.
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 12,241
Karma: 89531599
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
|
Quote:
https://batteryuniversity.com/ Yes, long term storage at 30% to 75% is best. But that would be weeks of no use and a higher ambient temperature. Though higher temperatures (not usually a problem in Ireland) age the cell fastest. Time and total cycles (i.e. 10 off 10% discharges = 1 cycle) als wear out the cell. Also quality. Some last for over 10 years and some only 2 years. The challenge with some things is opening the case. Similar enough battery/cell packs are usually available. 40 year old things designed for 500 mAH NiCd with replacement 2500 mAH NiMH cells do need the charger unplugged as the trickle current is too high, though the regular charge current may be lower than is possible. There are only a few weeks a year here when the temperature would be high for a fully charged unused LiPoly. Last edited by Quoth; 05-19-2024 at 02:13 AM. |
|
![]() |
![]() |
![]() |
Tags |
battery life, clara hd |
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Clara HD sometimes unresponsive (battery?) | Canuck_in_Japan | Kobo Reader | 0 | 11-06-2022 11:06 PM |
Clara HD battery issue | peejayw | Kobo Reader | 9 | 09-20-2022 03:28 AM |
Clara HD Clara Battery dies under 40-50%.Replacement? | Erekle | Kobo Reader | 7 | 05-11-2022 07:30 PM |
PRS-T1 Battery dies overnight after new books added with calibre | eosrose | Sony Reader | 6 | 05-05-2013 09:52 PM |
Classic Help, Nook battery dies after a few hours | godlike1001 | Barnes & Noble NOOK | 4 | 08-29-2010 02:00 PM |