Full charge capacity vs. Number of charge cycles.

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scillyisles · #61 Post by **scillyisles** » Sun Feb 13, 2005 1:04 pm

Model T42p 2373 QIG
9 cell battery
Full charge capacity 71.18 wh
Design capacity 71.28 wh
Cycle count 7
First used 2004-11

Model T41p 2373 GEG
9 cell battery
Full charge capacity 73.02wh
Design Capacity 71.28wh
Cycle count 12
First used date 2004-02

Peters · #62 Post by **Peters** » Sun Feb 13, 2005 1:13 pm

Model T40p 2373 G1G

9 cell battery
Manufacturer Sanyo
Manufacture Date 2004-01-12
First used 2004-05
Full charge capacity 57,68
Design capacity 71.28 wh
Cycle count 177

tripper · #63 Post by **tripper** » Mon Feb 14, 2005 11:47 am

Model of thinkpad T42

Number of cells 6 (internal) SONY Li-Ion
Design capacity 47.52
Full charge capacity 41.43 (87%)
Number of charge cycles 53
Manufactured date. 2004-06-04
First Use Date 2004-07

Number of cells 3 (ultrabay slim) SANYO Li-Polymer
Design capacity 23.76
Full charge capacity 18.83 (79%)
Number of charge cycles 106
Manufactured date. 2004-07-26
First Use Date 2004-08

Maybe someone has some tips for me as I always have the Ultrabay Slim (UBS) battery installed...

What happens here is that the UBS battery runs flat first before the internal one (obvoiusly). Thing is therefore you induce more charging cycles on the UBS battery which in turn shortens its life..

I tell you what though it's nice not to have the protruding 9-cell thingy hanging out the back ..

nikemen · #64 Post by **nikemen** » Mon Feb 14, 2005 12:53 pm

Model of thinkpad: T41
Number of cells 6
Design capacity 47.52
Full charge capacity 41.36 :-j
Number of charge cycles 89
Number of months since the manufactured date. 12 months, 2004-02-09
used almost a year

yumao1102 · #65 Post by **yumao1102** » Tue Feb 15, 2005 1:12 am

This is my first post
Model of Thinkpad: T41
Number of cells: 6
Design capacity: 47.52
Full charge capacity: 32.04
Remaining capacity: 15.53
Number of charge cycles: 130
Manufacturer name: Sanyo
Manufacture date: 2004-02-10
First used date: 2004-03

almost used one year

JHEM · #66 Post by **JHEM** » Tue Feb 15, 2005 10:07 am

This is my "backup" 6 cell battery:

Status: No activity
Remaining percentage: 100 %
Remaining capacity: 48.16 Wh
Full charge capacity: 48.16 Wh
Temperature: 27 C
Cycle count: 18
Manufacturer name: SONY
Manufacture date: 2004-03-24
First used date: 2004-04
Serial number: 1084
Bar-coding number: 1Z8PC43R11W
Battery name (FRU part number): IBM-92P1011
Device chemistry: Li-Ion
Design capacity: 47.52 Wh
Design voltage: 10.80 V

Here's my 9 cell info after a bit of charging:

Status: Charging
Remaining percentage: 89 %
Charge completion time: 1:04
Remaining capacity: 57.98 Wh
Full charge capacity: 65.41 Wh
Current: 0.23 A
Voltage: 12.48 V
Wattage: 2.81 W
Temperature: 25 C
Cycle count: 26
Manufacturer name: SANYO
Manufacture date: 2003-11-28
First used date: 2004-01
Serial number: 603
Bar-coding number: 1Z7SR3BW0GR
Battery name (FRU part number): IBM-08K8198
Device chemistry: Li-Ion
Design capacity: 71.28 Wh
Design voltage: 10.80 V

I'll have to figure out where I put my "original" 6 cell battery, it's around here someplace. It reports that the battery health is BAD and has the red display in Battery Information.

Regards,

James

simms · #67 Post by **simms** » Sun Mar 05, 2006 6:29 pm

Bought this one on eBay, so I'm using it as I like...

3 months, went from around 37Wh down 31Wh during that time.
Max cap 47.52Wh, made in 2003 Aug 11, first used 2003-Oct.

Not bad for a 3 year old battery, I guess. I drain it down often, maybe to about 20% 5 days a week before refilling at night.

thewhippingboy · #68 Post by **thewhippingboy** » Sun Mar 05, 2006 6:35 pm

Model of thinkpad: T41
Number of cells: 6
Design capacity: 47.52Wh
Full charge capacity: 27.18Wh
Number of charge cycles: 594
Number of months since the manufactured date: 21

Hanson · #69 Post by **Hanson** » Sun Mar 05, 2006 8:23 pm

Model of thinkpad: T43
Number of cells: 6-cell
Design capacity: 51.83Wh
Full charge capacity: 47.88Wh
Number of charge cycles: 14
Number of months since the manufactured date: 7 months

dr_st · #70 Post by **dr_st** » Mon Mar 06, 2006 4:05 am

As long as the thread was already bumped...

Model of Thinkpad: T42
Number of cells: 6-cell
Designe capacity: 47.52Wh
Full charge capacity: 45.45Wh
Cycles: 43
Manufactured: 03-2005 (12 months ago)
First used: 05-2005 (10 months ago)

AIX · #71 Post by **AIX** » Mon Mar 06, 2006 4:49 am

thewhippingboy wrote: Full charge capacity: 27.18Wh
Number of charge cycles: 594
Number of months since the manufactured date: 21

wow, 594 cycles! Mine has ~27Wh after ~160 cycles and 23 months since the manufactured date. Probably the age is more important than the number of cycles.

det922 · #72 Post by **det922** » Mon Mar 06, 2006 8:56 pm

design 51.84
capacity 43.88
6 cell battery will be one year this year 239 cycles

Guv'nor-K · #73 Post by **Guv'nor-K** » Mon Mar 20, 2006 5:40 pm

Model of thinkpad: T43
Number of cells: 6-cell
Design capacity: 51.84Wh
Full charge capacity: 49.25Wh
cycle count: 42
Manufacture date: 2005-09-15
First used date: 2006-02

Navck · #74 Post by **Navck** » Mon Mar 20, 2006 9:18 pm

The reason you shouldn't cycle batterys in your packs is that they don't all "evenly charge" (One cell may get a 110% charge (BAD!), another gets 90%)
The only "real" way you can charge each cell indivually would be to take them out or have a smart system that charges a cell a bit by bit with a CC/CV athlogram. But that would mean you couldn't do anything but wait for the battery to fully recharge...

PS = Lithiums when in hot weather, tend to degrade (Bump it high, you lose capacity, bump it higher, you'll risk "venting"). Venting is the fun thing of "when your battery decides its not happy in its specific enviorment, and decides that its seals should open up, leaking flame out."

Guv'nor-K · #75 Post by **Guv'nor-K** » Mon Mar 20, 2006 10:59 pm

this is my first laptop and quite honestly, i dont know a lot about the lithium batteries in them...

could you explain what you meant by "you shouldnt cycle the battery in its pack"? i understand a cycle would be a full charge and then a discharge but if you break a down some more for me, id appreciate it, or maybe a link where i could read up on them?

thanks!

christopher_wolf · #76 Post by **christopher_wolf** » Tue Mar 21, 2006 12:03 am

This is a good link to start out from; See

http://batteryuniversity.com/

You shouldn't run down LiIon batteries to 0% charge, that shortens their operational life span. You should also try to store the LiIon batteries in your Thinkpad at around ~40% charge. See;

http://www.thinkwiki.org/wiki/Maintenan ... _treatment

HTH

smugiri · #77 Post by **smugiri** » Tue Mar 21, 2006 12:51 am

jdhurst wrote:I looked up the battery information for my Lithium-Ion laptop battery, and it does not suggest deep discharges. Everywhere I have read about batteries say that deep discharges are not good for L-I batteries.

The advice as posted here is for Ni-MH batteries with a memory.
... JDHurst

Both arguments are right if we pause to realize that we are talking about 2 different scenarios. Regular use and battery re-calibration.

You do not want to deep discharge lithium ion batteries in the course of ordinary use and JDhurst is right is saying that you should plug the laptop in whenever and wherever you can to save its life. Partial discharge/charge cycles are better than full discharge/charge cycles in the course of ordinary use.

You do need to deep discharge to re-calibrate the battery which is done to improve the amount of run time you can get from the battery.

@christopher_wolf' link to battery university gives lots of good info including this technical article for those who may be interested.

princeatul · #78 Post by **princeatul** » Tue Mar 21, 2006 3:18 am

Model of thinkpad : T43
Number of cells : 6
Design capacity : 51.84 Wh
Full charge capacity : 53.46 Wh (can this be greater than Design Capacity??? )
Number of charge cycles : 2
Number of months since mfg : 2 months

Battery maintainance:
To increase battery lifespan, you have set your battery to start charging when below 88% and to stop charging at 94%.
somebody suggested to have settings similar to this. Don't remember thread.

--- Edit ---
Found the thread, read comment by hiyel on this thread.
It also rests on the premise that Partial discharge/charge cycles are better than full discharge/charge cycles

smugiri · #79 Post by **smugiri** » Tue Mar 21, 2006 11:03 am

Model of thinkpad: T40p
Number of cells: 9
Design capacity: 71.28Wh
Full charge capacity: 47.72Wh
Number of charge cycles: 139
Manufactured: 2004-11-08
First Used: 2005-03

AIX wrote:
thewhippingboy wrote: Full charge capacity: 27.18Wh
Number of charge cycles: 594
Number of months since the manufactured date: 21
wow, 594 cycles! Mine has ~27Wh after ~160 cycles and 23 months since the manufactured date. Probably the age is more important than the number of cycles.

This gels perfectly with the argument that frequent partial discharges are better that complete discharges.

Guv'nor-K · #80 Post by **Guv'nor-K** » Wed Mar 22, 2006 1:30 am

Links are really useful!

Thanks Chris!

ujav · #81 Post by **ujav** » Wed Mar 22, 2006 10:31 am

Model of thinkpad: T30
Number of cells: 6
Design capacity: 47.52Wh
Full charge capacity: 34.64Wh
Number of charge cycles: 208
First Use date: 2002-12

magura · #82 Post by **magura** » Thu Mar 23, 2006 3:55 am

Model: R50p
Cells: 9
Design capa.: 71.28 Wh
Full charge: 46.51 Wh
Cycle count: 46
Manufacture date: 2003-12-16 (sanyo)
1st used date: 2004-02

Model: T41p
Cells: 9
Design capa.: 71.28 Wh
Full charge: 59.27 Wh
Cycle count: 39
Manufacturer date: 2004-04-27 (sony)
1st used date: 2004-06

smugiri · #83 Post by **smugiri** » Thu Mar 23, 2006 11:53 am

smugiri wrote:Model of thinkpad: T40p
Number of cells: 9
Design capacity: 71.28Wh
Full charge capacity: 47.72Wh
Number of charge cycles: 139
Manufactured: 2004-11-08
First Used: 2005-03

In the spirit of eating my own dog food, I run 4 deep discharge cycles to recalibrate the battery like IBM recommends. Here are the old/new numbers for comparison.

Number of cells: 9
Design capacity: 71.28Wh
Full charge capacity: before recalibration -> 47.72Wh
after recalibration -> 52.56Wh
Number of charge cycles: before recalibration -> 139 cycles
after recalibration -> 143 cycles
Manufactured: 2004-11-08
First Used: 2005-03

So, I have an increase of approximately 7% from running 4 deep disharge cycles. Not bad in my opinion.

Esben · #84 Post by **Esben** » Sat Mar 25, 2006 5:51 am

Model of thinkpad: T42-2378FVU
Number of cells: 6 cells
Design capacity: 47.52 Wh
Full charge capacity: 43.92 Wh
Number of charge cycles: 57
Number of months since the manufactured date: 14 months (2005-01-14)
Number of months since first use: 9 months (2005-06)

I mainly use the AC adaptor, only occasionally using battery.
The fan is turned off 99 % of the time I use the laptop, which causes the underside of the laptop to often be quite warm. It also has to do with surfing on a coach, legs or the bed.

I very much appreciate a battery loss of only 7.5% during the period I've had it. No battery recondition cycle has been done.

dyne · #85 Post by **dyne** » Sun Mar 26, 2006 3:31 pm

Model of thinkpad: T41
Number of cells: 6 cells
Design capacity: 47.52 Wh
Full charge capacity: 24.78 Wh
Number of charge cycles: 288
Number of months since the manufactured date: 26 months (jan 2004)
Number of months since first use: 25 months (feb 2004)

I need a new battery

suaveguyc · #86 Post by **suaveguyc** » Sun Mar 26, 2006 5:20 pm

Model of thinkpad: T43
Number of cells: 6 cells
Design capacity: 51.84
Full charge capacity: 47.60 Wh
Number of charge cycles: 29
Number of months since the manufactured date: 9 (2005-6-21)
Number of months since first use: 7 (2005-8)

I have deep discharged it a few times (maybe 4, to around 4%...that is a deep discharge, right?) and it seems to have held up pretty well.

#87 Post by **underclocker** » Sun Mar 26, 2006 9:39 pm

Model: T40 (2373-8CU)
Cells: 6
Design Capacity.: 47.52 Wh
Full Charge: 45.38 Wh
Cycle Count: 35
Manufacturer Name: Sanyo
Manufacturer Date: 2004-10-05
First Used Date: 2004-12
Battery Name (FRU): 08K8193

giasoldacastlar · #88 Post by **giasoldacastlar** » Wed Dec 27, 2006 4:31 pm

Model: T42 (2373-4WG)
Cells: 6
Design Capacity.: 47.52 Wh
Full Charge: 25.47 Wh
Cycle Count: 210
Manufacturer Name: Sanyo
Manufacturer Date: 2004-09-10
First Used Date: 2004-09
Battery Name (FRU): 08K8193

Last (and only) reconditioning: 2006-11-10 at about 200 cycles. I deep discharged the battery several times while travelling and a few times on purpose after the recalibration. Finally, I always used the default charging thresholds (96% - 100%).

#89 Post by **underclocker** » Wed Dec 27, 2006 8:40 pm

Another T40 battery, came with used machine (not all my cycles!!!)

I wonder how many cycles a battery can take! This one still holds a charge for over an hour.

Model of Thinkpad: T40
Number of Cells: 6-cell
Design Capacity: 47.52Wh
Full Charge Capacity: 20.18Wh
Cycle Count: 683
Manufacturer Name: SANYO
Manufacture Date: 2004-06-28
First used Date: 2004-07
Battery Name (FRU Part Number): IBM-08K8193

Melvyn · #90 Post by **Melvyn** » Thu Dec 28, 2006 3:54 pm

Model of thinkpad T42
Number of cells 9
Design capacity 77.76
Full charge capacity 68.80
Number of charge cycles 179
Manufactured date. 2005-07-19
First Use Date 2005-09

At max battery it reach 7 hours, low dim, and so on
At max performance it reach 4 hours.

I did buy it used in ebay.

Full charge capacity vs. Number of charge cycles.

pretty decent actually

Re: Full charge capacity vs. Number of charge cycles.

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