[ltp] One battery or two?

Michael Gaber linux-thinkpad@linux-thinkpad.org
Thu, 02 Oct 2008 22:02:23 +0200


This is a cryptographically signed message in MIME format.

--------------ms010601000600080301090409
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

Christos Papadopoulos schrieb:
> Thanks for all the good info below. However, I have a few questions.
> 
> - Some people suggest unpluging the battery completely. I am a bit
>   concerned about that. What if you lose power, or trip over the chord?
>   Wouldn's sudden loss of power be bad for your laptop?

sure it would be. Not for the notebook itself (except evtl the hdd) but
for the data you're using at this moment. The first question here was
not about battery or not, but about 1 or 2 batteries

> - About setting the charge level low (say 40%). I interpret that to mean
>   that the battery will be allowed to discharge to 40% even if you are
>   plugged into wall power, and then recharge. If this happens everytime,
>   isn't that worse than letting your battery discharge to say 80% (for
>   1 hour of battery use) and then recharge?

nope. there are 2 files in smapi: start_charge_threshold (1) and
stop_charge_threshold (2). my current setting is (1) at 30% and (2) at
70% so my thinkpad will not charge the battery at all if it has between
30 and 70% of it's capacity. it will NOT discharge the battery while
plugged in, so you perhaps save yourself some cycles (doubt that) but
keep the battery away from the bad last 20 or so % which stress the
cells extremely when charged because the controller has to use high
voltages to charge the cells.

with this setting I'm currently at 16.38% capacity loss of my nearly 2
year old 9-cell battery of my t60 with 354 cycles on it

> 
> - If I set the recharge threshold to 40%, will my battery always discharge
>   and recharge? In other words, if I am plugged in, will it still go
>   through the charge cycles? If yes, how can that be good?
> 
> Christos.
> 

Greetings Michael

--------------ms010601000600080301090409
Content-Type: application/x-pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature

MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIKdjCC
BTcwggMfoAMCAQICAwOSGTANBgkqhkiG9w0BAQUFADB5MRAwDgYDVQQKEwdSb290IENBMR4w
HAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmlu
ZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZzAeFw0wNzA1
MTExODI5NDlaFw0wOTA1MTAxODI5NDlaMD4xFjAUBgNVBAMTDU1pY2hhZWwgR2FiZXIxJDAi
BgkqhkiG9w0BCQEWFU1pY2hhZWwuR2FiZXJAZ214Lm5ldDCCASIwDQYJKoZIhvcNAQEBBQAD
ggEPADCCAQoCggEBANlvNCEKkhAhmwIpzXamq89nexUPZxbvGR05bN8NlABb/ZkrsUzq56ni
E4uA61Uuwz3stsXXPN5SOV+oJABDWgvgUsk4fZavEMbP7Kk5iJpZf+ZYDc+z+cYEgxLcQ/v2
I3j5r7sdT8L6KuB4mvJaQ2WLMcAzyE4J3b39IzPHjrKkTWHyNQP8UUVEJ8qIZ3oCNAYYkTar
2nKv9uCz//ne40luTpPaEi4vrV5x3F9VKLVLWp1pjceE2xC6wSRlF9ZouOhk6aefTeJ0zMCK
yiCxhk/4pDM5GfXePU7a05uP7NWtvFPPVt8ahIXoX4J4mRdxByijW1wIAqP2ghjL0IHWHlcC
AwEAAaOCAQEwgf4wDAYDVR0TAQH/BAIwADBWBglghkgBhvhCAQ0ESRZHVG8gZ2V0IHlvdXIg
b3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQgb3ZlciB0byBodHRwOi8vd3d3LkNBY2Vy
dC5vcmcwQAYDVR0lBDkwNwYIKwYBBQUHAwQGCCsGAQUFBwMCBgorBgEEAYI3CgMEBgorBgEE
AYI3CgMDBglghkgBhvhCBAEwMgYIKwYBBQUHAQEEJjAkMCIGCCsGAQUFBzABhhZodHRwOi8v
b2NzcC5jYWNlcnQub3JnMCAGA1UdEQQZMBeBFU1pY2hhZWwuR2FiZXJAZ214Lm5ldDANBgkq
hkiG9w0BAQUFAAOCAgEAzOZBrP0g6O72GC4sUht1eAe6QIKHlf4j+c2+mOOB1MHnIi1NHIvD
cEHcfZ5TNQe6kiqe1Vy/HPqiMEudSFjq/Wwa4aZTp7vCKJt9OlDis/I3eEDv5qLhT1sDPKin
mkikMUGZLuBwJGcqGmcOkbVdQxDB7hJcqQAlYjU7Bbx/9c7owfpxb99lHvAUhdADc/YpIfiv
Z+dn96pJWU9CfB0q2noE3Mye70C0/6SYIFZp15kmgabxcrCc95BXTfC5odCnFL3z9/AnFeNB
xehYUTkwShTrBEPIfB7CueXQBEimpy5XjouaBmtTo/TtTl9uFbbIa9Qt5y8w+5ZaH7GKT7q2
lXN7broy6UNflEh3m7zIwfD4auLUKR3yNc7hgilwg7kkumQDS5lkapzYJxRy5+/FsKg0V131
tvdvNRlNtSY2hi1JRP2a9WPub5i7/7sJI6cB5n/l/t7EGd6HA4Jkp2wyJ8+Gn9A5x6aMjRA2
db8OCR15bkcvlPmQaPKE9KGBE1qOl7fc2hxX13pZsynMaqZOGRvttDGmyJWBbU1wyVBDf/kQ
xxD0vz8MSTRJSyC+lka1/msDCvyYrPzWdIkNzH9iVuHnuPYYBxvhsgzB7clZWH2kiVaolfcv
JLzOVSHodm1ZgRQlFkb9qxd1Gtx86FjCJXqXFU7+K/+byhaoVBKs8SAwggU3MIIDH6ADAgEC
AgMDkhkwDQYJKoZIhvcNAQEFBQAweTEQMA4GA1UEChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0
cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5
MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcwHhcNMDcwNTExMTgyOTQ5WhcN
MDkwNTEwMTgyOTQ5WjA+MRYwFAYDVQQDEw1NaWNoYWVsIEdhYmVyMSQwIgYJKoZIhvcNAQkB
FhVNaWNoYWVsLkdhYmVyQGdteC5uZXQwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB
AQDZbzQhCpIQIZsCKc12pqvPZ3sVD2cW7xkdOWzfDZQAW/2ZK7FM6uep4hOLgOtVLsM97LbF
1zzeUjlfqCQAQ1oL4FLJOH2WrxDGz+ypOYiaWX/mWA3Ps/nGBIMS3EP79iN4+a+7HU/C+irg
eJryWkNlizHAM8hOCd29/SMzx46ypE1h8jUD/FFFRCfKiGd6AjQGGJE2q9pyr/bgs//53uNJ
bk6T2hIuL61ecdxfVSi1S1qdaY3HhNsQusEkZRfWaLjoZOmnn03idMzAisogsYZP+KQzORn1
3j1O2tObj+zVrbxTz1bfGoSF6F+CeJkXcQcoo1tcCAKj9oIYy9CB1h5XAgMBAAGjggEBMIH+
MAwGA1UdEwEB/wQCMAAwVgYJYIZIAYb4QgENBEkWR1RvIGdldCB5b3VyIG93biBjZXJ0aWZp
Y2F0ZSBmb3IgRlJFRSBoZWFkIG92ZXIgdG8gaHR0cDovL3d3dy5DQWNlcnQub3JnMEAGA1Ud
JQQ5MDcGCCsGAQUFBwMEBggrBgEFBQcDAgYKKwYBBAGCNwoDBAYKKwYBBAGCNwoDAwYJYIZI
AYb4QgQBMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcwAYYWaHR0cDovL29jc3AuY2FjZXJ0
Lm9yZzAgBgNVHREEGTAXgRVNaWNoYWVsLkdhYmVyQGdteC5uZXQwDQYJKoZIhvcNAQEFBQAD
ggIBAMzmQaz9IOju9hguLFIbdXgHukCCh5X+I/nNvpjjgdTB5yItTRyLw3BB3H2eUzUHupIq
ntVcvxz6ojBLnUhY6v1sGuGmU6e7wiibfTpQ4rPyN3hA7+ai4U9bAzyop5pIpDFBmS7gcCRn
KhpnDpG1XUMQwe4SXKkAJWI1OwW8f/XO6MH6cW/fZR7wFIXQA3P2KSH4r2fnZ/eqSVlPQnwd
Ktp6BNzMnu9AtP+kmCBWadeZJoGm8XKwnPeQV03wuaHQpxS98/fwJxXjQcXoWFE5MEoU6wRD
yHwewrnl0ARIpqcuV46LmgZrU6P07U5fbhW2yGvULecvMPuWWh+xik+6tpVze266MulDX5RI
d5u8yMHw+Gri1Ckd8jXO4YIpcIO5JLpkA0uZZGqc2CcUcufvxbCoNFdd9bb3bzUZTbUmNoYt
SUT9mvVj7m+Yu/+7CSOnAeZ/5f7exBnehwOCZKdsMifPhp/QOcemjI0QNnW/DgkdeW5HL5T5
kGjyhPShgRNajpe33NocV9d6WbMpzGqmThkb7bQxpsiVgW1NcMlQQ3/5EMcQ9L8/DEk0SUsg
vpZGtf5rAwr8mKz81nSJDcx/Ylbh57j2GAcb4bIMwe3JWVh9pIlWqJX3LyS8zlUh6HZtWYEU
JRZG/asXdRrcfOhYwiV6lxVO/iv/m8oWqFQSrPEgMYIDlDCCA5ACAQEwgYAweTEQMA4GA1UE
ChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlD
QSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy
dC5vcmcCAwOSGTAJBgUrDgMCGgUAoIIB6DAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwG
CSqGSIb3DQEJBTEPFw0wODEwMDIyMDAyMjNaMCMGCSqGSIb3DQEJBDEWBBSIDCWatuaIuTpx
BGXup/x/g9tf8TBfBgkqhkiG9w0BCQ8xUjBQMAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAO
BggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgw
gZEGCSsGAQQBgjcQBDGBgzCBgDB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQLExVodHRw
Oi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkx
ITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDA5IZMIGTBgsqhkiG9w0BCRAC
CzGBg6CBgDB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2Vy
dC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0B
CQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDA5IZMA0GCSqGSIb3DQEBAQUABIIBAHcbF8xijQlj
kHED7uY2v6H/WKk5xlF/uVfIRqFvoUA8AUJ5ZrToElLcBPWWReQ7/w3PrM6oI89SXPSGsSka
Mc/eU0k2lN5kB6HxH2eLOG4j88PCnMM30U+BfjoX4UDbiSwxtagwvUMo6m7VXc9uhEgbvQUo
B1d3G8Asp+jvtvWArrqggLM8EqmX3ccCwv0lCnjXuQt5Jt6cTzv6F03Bh33MG+QzT1/u4JLx
CDNCtmTY+Ya2RMfleAwtUiRAkqakF37tCyAlRz2/BL3el3zdPF10kdbS1aWHGOuJmlaL++in
lg7PSktgGm843BpyMum/nEINTTshxWVwIqNmUydJpyAAAAAAAAA=
--------------ms010601000600080301090409--