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mightyyid
Pocket GPS Verifier
Joined: Apr 04, 2006
Posts: 83
Location: Melbourne, Australia
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 Posted: Tue Jul 21, 2009 9:42 am Post subject: |
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Gits - cannot believe you have devices that last that long. 4 hours.
I know my battery is knackered but even so, that fact you cannot change them easily is also a major issue... |
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Rick-uk
Lifetime Member
Joined: Apr 16, 2006
Posts: 320
Location: BS20, North Somerset
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| Posted: Tue Jul 21, 2009 5:53 pm Post subject: |
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I can have my TT on charge for a constant 8 hours and it lasts less than 20 minutes after the power is removed, not enough time for me to drive home 
It is less than 18 months old.
Never tried it for a walking route as it would die before I get to the first junction |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1936
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| Posted: Tue Jul 21, 2009 7:09 pm Post subject: |
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I know that the people "in the know" say that it is no longer necessary to let your modern-day battery discharge fully before fully re-charging, but I wonder what percentage of TT users with a good battery life fully charge and then fully discharge (i.e. old school) their batteries and how many users with a bad battery life more or less keep their TT connected to a power supply (i.e. modernists).
I know that my TT Go730 is still new(ish) but i am fanatically old school and fully charge/discharge. I have not yet noticed any degradation of battery life.
_________________
Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20. |
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Oldboy
Pocket GPS Moderator
Joined: Dec 08, 2004
Posts: 10642
Location: Suffolk, UK
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| Posted: Tue Jul 21, 2009 8:49 pm Post subject: |
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My 910 has only been fully discharged once ... when I left it switched on, on the desktop mount. I walked away and promptly forgot it.
It has never been below about 25% on the graphic display. I should point out that using 7.903 software it does correctly show 100% charge when it is.
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Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120 |
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Snudge
Lifetime Member
Joined: Aug 22, 2007
Posts: 211
Location: Peterborough
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| Posted: Tue Jul 21, 2009 10:41 pm Post subject: |
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| AliOnHols wrote: | I know that the people "in the know" say that it is no longer necessary to let your modern-day battery discharge fully before fully re-charging, but I wonder what percentage of TT users with a good battery life fully charge and then fully discharge (i.e. old school) their batteries and how many users with a bad battery life more or less keep their TT connected to a power supply (i.e. modernists).
I know that my TT Go730 is still new(ish) but i am fanatically old school and fully charge/discharge. I have not yet noticed any degradation of battery life. |
Fully discharging before charging was good for NiCad batteries but SatNavs use Li-ion and that is the worst thing you could do. |
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exportman
Frequent Visitor
Joined: Mar 26, 2006
Posts: 261
Location: United Kingdom
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| Posted: Tue Jul 21, 2009 10:49 pm Post subject: |
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Hi
I have a tt rider2 and regularly get over 5 hours from a full charge in use including the bluetooth to my helmet.
( The motocycle dock is busted has not worked for some time so I have to depend on the battery)
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Tue Jul 21, 2009 11:35 pm Post subject: |
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| Snudge wrote: |
Fully discharging before charging was good for NiCad batteries but SatNavs use Li-ion and that is the worst thing you could do. |
He's dead right!
From Wikipaedia:
| Quote: | Guidelines for prolonging Li-ion battery life
* Lithium-ion batteries should be charged early and often. However, if they are not used for a long time, they should be brought to a charge level of around 40%–60%
* Lithium-ion batteries should not be frequently discharged fully and recharged ("deep-cycled"), but this may be necessary after about every 30th recharge to recalibrate any electronic charge monitor (e.g. a battery meter). This allows the monitoring electronics to more accurately estimate battery charge.[26] This has nothing to do with the memory effect.
* Li-ion batteries should never be depleted to below their minimum voltage, 2.4 V to 3.0 V per cell. |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1936
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| Posted: Wed Jul 22, 2009 3:42 am Post subject: |
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Snudge and Andy_P, many thanks for the advice. Looks like I'll be changing my life style.
_________________
Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20. |
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Calomax
Lifetime Member
Joined: Sep 30, 2005
Posts: 988
Location: St Martin's, Guernsey
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| Posted: Wed Jul 22, 2009 8:52 am Post subject: |
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I destroyed a battery on a hedge trimmer by discharging it fully. I was in the habit of doing so regularly with Ni-cads and didn't know things had changed.
It never accepted a charge again and had to be replaced.
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TT Go Essential
Last edited by Calomax on Thu Jul 23, 2009 8:38 am; edited 1 time in total |
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Rick-uk
Lifetime Member
Joined: Apr 16, 2006
Posts: 320
Location: BS20, North Somerset
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| Posted: Wed Jul 22, 2009 6:49 pm Post subject: |
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| Snudge wrote: | | Fully discharging before charging was good for NiCad batteries but SatNavs use Li-ion and that is the worst thing you could do. |
Good in theory but my TT520 discharges itself.
You should fully flatten them once a month though (as I understand it) |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Thu Jul 23, 2009 1:41 am Post subject: |
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| Rick-uk wrote: |
You should fully flatten them once a month though (as I understand it) |
Did you not see the Wikipedia quotes above? |
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Anita
Pocket GPS Moderator
Joined: Mar 15, 2006
Posts: 3219
Location: Windlesham, Surrey
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| Posted: Thu Jul 23, 2009 10:20 am Post subject: |
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| Andy_P wrote: | | Did you not see the Wikipedia quotes above? |
Or for information from a more authoritative source than Wikipedia try here.
_________________
Anita
TomTom VIA 135 - App 12.075
UK map 1125.12264
Samsung Galaxy S21 |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1936
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| Posted: Thu Jul 23, 2009 2:03 pm Post subject: |
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I few post back, I must admit I was happy learn that I was wrong about charging cycles. Li-Ion batteries seemed pefect and I was willing to become a "Modernist".
However, if I am reading the data in "figure1" from Anita's link correctly, we shouldn't charge Li-Ion fully and we shouldn't let them fully discharge! The optimum charge level for Li-Ion battery longevity is 40% and we should get about "3 years life span" or between "300-500 recharge cycles" (between a year and a year and a half of daily use). So if we charge to 45% (how do we know?) and use to about 35% (how do we tell?), our TomTom batteries could last for 3 years!
Carumba!! So this is progress? But it's not progress as I know it Jim!
Some of my cordless Ni-Cd battery tools (DeWalt, Bosch, Hitatchi, etc.) which have been regularly charged and fully discharged for several years, some almost 9 years, are still performing well and give me no trouble.
I think I'm switching back to "Old School" asap. Or am I missing something here?
More than willing to be wrong again, AliOnHols.
_________________
Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20. |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Thu Jul 23, 2009 4:57 pm Post subject: |
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| Anita wrote: |
Or for information from a more authoritative source than Wikipedia try here. |
Meow! 
Actually the citation/reference quoted in that Wikipaedia article was
26. Buchmann, Isidor (September 2006). "BatteryUniversity.com: How to prolong lithium-based batteries". Cadex Electronics Inc.. http://www.batteryuniversity.com/parttwo-34.htm.
so I think they're at about the same level of authority ...  |
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Anita
Pocket GPS Moderator
Joined: Mar 15, 2006
Posts: 3219
Location: Windlesham, Surrey
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| Posted: Thu Jul 23, 2009 5:59 pm Post subject: |
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| Andy_P wrote: | Actually the citation/reference quoted in that Wikipaedia article was
26. Buchmann, Isidor (September 2006). "BatteryUniversity.com: How to prolong lithium-based batteries". Cadex Electronics Inc.. http://www.batteryuniversity.com/parttwo-34.htm.
so I think they're at about the same level of authority ... |
Ah, but you didn't include the source of the reference in your previous post!
I just think there are more reliable sources to quote than Wikipedia, where someone like me can enter rubbish!
_________________
Anita
TomTom VIA 135 - App 12.075
UK map 1125.12264
Samsung Galaxy S21 |
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