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Joined: Dec 08, 2004 Posts: 10642 Location: Suffolk, UK
Posted: Thu Jul 23, 2009 6:12 pm Post subject:
AliOnHols wrote:
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!
The 40% charge refers to the Battery being in storage. Fig 1 just shows how much charge is lost by the internal mechanics of the battery.
The recharge cycles refers to how many times the battery is allowed to get to the low voltage state before it is recharged. If the voltage falls to about 50% and is then topped up, it is not the same as a recharge cycle. The battery is quite happy with this.
The Classic GO I purchased in 2004 is still going strong, and still achieves about 6 hours use before the battery warning comes on. That has only happened 3 or 4 times just to see what the condition of the battery was. It is normally kept in the top quarter of the charge graphic.
AliOnHols wrote:
So if we charge to 45% (how do we know?)
Earlier Devices, that had an SD Card only, had an easy way to tell.
Take the SD Card out and when you pressed, and held, the on/off button a screen full of useful information was displayed, one of which was the battery voltage. _________________ Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120
Please excuse my ignorance but, assuming the ambient temperature to be 25 deg C. and if I, as a "typical user", recharged my Li-Ion battery to 100% wouldn't the battery life be LESS than the figures I have quoted and am already unhappy with? i.e 80% after 1 year versus 96% after 1 year.
As I read it, If I never used my device but kept it in storage on a trickle charge at 40% I should achieve the maximum battery life of three years.
Regards.
P.S. Batteries "ain't my bag!" - Nasty, heavy corrosive things full of magic!. Sorry If I am still way off the mark. _________________ Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20.
Joined: Dec 08, 2004 Posts: 10642 Location: Suffolk, UK
Posted: Thu Jul 23, 2009 9:11 pm Post subject:
AliOnHols wrote:
Please excuse my ignorance but, assuming the ambient temperature to be 25 deg C. and if I, as a "typical user", recharged my Li-Ion battery to 100% wouldn't the battery life be LESS than the figures I have quoted and am already unhappy with? i.e 80% after 1 year versus 96% after 1 year.
A battery with 40% charge and stored for 1 year, would retain a charge of 96% of the 40% initial charge. Approx 38%
A battery at 100% charge and stored for 1 year, would retain a charge of 80% of the 100% initial charge.
AliOnHols wrote:
As I read it, If I never used my device but kept it in storage on a trickle charge at 40% I should achieve the maximum battery life of three years.
As the article states, it's heat and high charge/discharge cycles that do most damage.
The 3 years life talked about here is mainly related to laptop usage, and these run hotter and at higher currents than satnavs.
Perhaps one reason not to mount the unit on the windscreen on a hot day. _________________ Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120
Regards. _________________ Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20.
Joined: Mar 09, 2006 Posts: 194 Location: Barnsley, South Yorkshire.
Posted: Fri Jul 24, 2009 8:21 am Post subject:
Another point on fully charged and discharged states.
The electronics included with the battery should have a large safety margin built in to prevent it getting to the 'real' 100% as they become unstable if overcharged.
I assume that there's a similar cut off for discharging.
Joined: Jan 14, 2005 Posts: 19638 Location: Blackpool , Lancs
Posted: Fri Jul 24, 2009 8:32 am Post subject:
Have a watch of This to get an idea how Li-Pol batteries can behave if incorrectly charged, there are plenty of other videos on YouTube involving LiPol cells as they make very good fireworks - Mike
Joined: Sep 30, 2005 Posts: 988 Location: St Martin's, Guernsey
Posted: Fri Jul 24, 2009 9:09 am Post subject:
AliOnHols wrote
Quote:
Calomax, re: Figure 1,
Please excuse my ignorance but, assuming the ambient temperature to be 25 deg C. and if I, as a "typical user", recharged my Li-Ion battery to 100% wouldn't the battery life be LESS than the figures I have quoted and am already unhappy with? i.e 80% after 1 year versus 96% after 1 year.
As I read it, If I never used my device but kept it in storage on a trickle charge at 40% I should achieve the maximum battery life of three years.
Regards.
P.S. Batteries "ain't my bag!" - Nasty, heavy corrosive things full of magic!. Sorry If I am still way off the mark.
Sorry, it's all above my head and I'm not sure what you mean. All I know is you're not supposed to discharge them completely like ni-cads, which is what I did in my ignorance.
Hopefully Oldboy has answered your question. _________________ TT Go Essential
Sorry, it's all above my head and I'm not sure what you mean. All I know is you're not supposed to discharge them completely like ni-cads, which is what I did in my ignorance.
Hopefully Oldboy has answered your question.
Sorry Calomax, My post was to Oldboy and I should have addressed it to him. Oldboy has indeed helped me understand Li-Ion batteries a bit better now.
Apologies.
Regards. _________________ 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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