G7 CDHK battery settings question...

Started Oct 13, 2007 | Discussions
Photofreak7
Veteran MemberPosts: 5,703
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G7 CDHK battery settings question...
Oct 13, 2007

What figures do you use to make the battery % indicator accurate. Mine always shows 92/93% when the battery is fully charged and the bar indicator never shows completely full. I have messed with the voltage min/max settings and it changes the % but has anyone figured out the correct combination for an accurate %?

"Exposure to the Son can keep us from being burned"

Matt, PA, U.S.
Canon S5IS, G7, Panasonic TZ3
http://www.pbase.com/photofreak777

Abana
Senior MemberPosts: 1,603
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Re: G7 CDHK battery settings question...
In reply to Photofreak7, Oct 13, 2007

Photofreak7 wrote:

What figures do you use to make the battery % indicator accurate.
Mine always shows 92/93% when the battery is fully charged and the
bar indicator never shows completely full. I have messed with the
voltage min/max settings and it changes the % but has anyone figured
out the correct combination for an accurate %?

I use:
Max: 8025
Min: 6850

I determined the value for max (using Show Volts) by taking the voltage from a freshly charged battery.

The Min value: I allowed the battery to run down until the Factory Battery Low Indicator appeared. I then inserted that value into the Min. field.

This was the 2nd time I attempted to determine the values for the battery indicator. The first time I took the longer route and obtained less accurate results.

I have been using these values since the G7 CHDK came out and have found them to be satisfactory.

abana

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Photofreak7
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I'm assuming all NB-2LH's are the same
In reply to Abana, Oct 13, 2007

and I will try your settings. Thanks for the info. I had mine set very close to yours. One thing is for sure it doesn't stay at 100% for long - LOL

Abana wrote:

Photofreak7 wrote:

What figures do you use to make the battery % indicator accurate.
Mine always shows 92/93% when the battery is fully charged and the
bar indicator never shows completely full. I have messed with the
voltage min/max settings and it changes the % but has anyone figured
out the correct combination for an accurate %?

I use:
Max: 8025
Min: 6850

I determined the value for max (using Show Volts) by taking the
voltage from a freshly charged battery.

The Min value: I allowed the battery to run down until the Factory
Battery Low Indicator appeared. I then inserted that value into the
Min. field.

This was the 2nd time I attempted to determine the values for the
battery indicator. The first time I took the longer route and
obtained less accurate results.
I have been using these values since the G7 CHDK came out and have
found them to be satisfactory.

abana

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Abana
Senior MemberPosts: 1,603
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Re: I'm assuming all NB-2LH's are the same
In reply to Photofreak7, Oct 14, 2007

Photofreak7 wrote:

and I will try your settings. Thanks for the info. I had mine set
very close to yours. One thing is for sure it doesn't stay at 100%
for long - LOL

You could always set your max a little lower. Doing so won't extend battery life, but it will stay at 100% a little longer. The mind is a terrible thing :).

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jose42
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Re: I'm assuming all NB-2LH's are the same
In reply to Abana, Oct 14, 2007

Let me share my personal findings on this.

Voltage of the batery when the charger finish the cycle = 8.3 Volts.
Voltage when the original red batery appears = 7.0 Volts.

some reading on the subject.
Li-ion bateries behave like traditional lead-acid.
They don´t like deep discharges and overcharging.
durability doesn´t depend on the charging cycles, but on age.
deep discharge speeds the wearing process.

I´ve set the voltages as follows.
max = 8.200 Volts.
min = 7.100 Volts

Jose

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Abana
Senior MemberPosts: 1,603
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Re: I'm assuming all NB-2LH's are the same
In reply to jose42, Oct 16, 2007

jose42 wrote:

Let me share my personal findings on this.

Voltage of the batery when the charger finish the cycle = 8.3 Volts.
Voltage when the original red batery appears = 7.0 Volts.

some reading on the subject.
Li-ion bateries behave like traditional lead-acid.
They don´t like deep discharges and overcharging.
durability doesn´t depend on the charging cycles, but on age.
deep discharge speeds the wearing process.

Interesting info, and has prompted me to investigate, and your assertion seems to be correct. I have no qualms with extending my battery life! In the several articles I read via googling "charging Li-ion, there is surprisingly little information directing one to a "shallow discharge" of the battery. The implication, however, is there in most articles, and there are a few articles in which it is directly mentioned.

The term "deep discharge" is found quite often, but is not usual except under certain circumstances (such as not being used for one or two years). Most agree that "deep discharge' is unlikely to occur under normal use because devices that use Li-ion batteries generally have safety shut down routines that prevent the device from causing "deep discharge" to the battery.

This, however, does not indicate that the devices involved initiate shut down to maintain 'shallow discharge', and I agree with the assesment that 'shallow discharge' will prolong the life of the battery. I have adjusted the minimum value of the battery meter to the voltage you submitted. Thanks for posting this valuable information!

Thanks,
abana

I´ve set the voltages as follows.
max = 8.200 Volts.
min = 7.100 Volts

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jose42
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Re: I'm assuming all NB-2LH's are the same
In reply to Abana, Oct 17, 2007

Hello Abana.

Thanks for the information.
The term ¨deep discharge¨is somehow difuse.
What I remember for this is a discharge that goes beyond 80% of total capacity.
(From lead-acid batteries)

At the same time experience about li-ions are recent.

What is clear so far according to information collected in google is that they don´t behave like nicads nor like nimhs.

Begining with the voltage per cell wich is 3.6Volts nominal against 1.2volts of the other tipes.

The minimum value of 7.1Volts was choosen because two reasons.

1) Is reccomended by manufacturers that minimum discharge voltage is keep at the maximum practical, in order to extend battery life

2) I want to have a safety factor, the original setting point of Canon on 7.0Volts is very close to the programmed shut down.

I have two batteries, and is not an inconvenience to have a little less capacity if I can extend battery life.

BTW, all this talking is not possible without the CHDK.

Jose

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