Maha MH-C9000 SUPPORT / FAQ - continuation

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I would. It certainly isn't going to hurt anything. The cells may have been in storage for a while and NiCd's are better cycled more often than NiMH cells anyway. On the other hand, use in a solar light is going to accomplish the same thing, really. The cells will be pretty much totally discharged and charged every day, sometihng that is not so good for NiMH cells. This is part of the reason NiCd's are preffered for such use.

As for charging with the C9000, all the same rules apply. But then I'm pretty sure you already knew that.

Dave

 

[hagbard]

Hey guys. Got the replacement charger this afternoon, put in some AAs to Charge as a basic test to see if it works. More oddness. Even though its Done, the time tells me 10 minutes even though its been over an hour since done...no updates on the minutes, said 10 minutes 30 minutes ago, 15 minutes ago, etc.

 

[Mr Happy]

Hey guys. Got the replacement charger this afternoon, put in some AAs to Charge as a basic test to see if it works. More oddness. Even though its Done, the time tells me 10 minutes even though its been over an hour since done...no updates on the minutes, said 10 minutes 30 minutes ago, 15 minutes ago, etc.

The indicated time is the charging duration, so it would be 10 minutes from the time you started charging until Done appeared. Once Done has appeared the information in each channel is frozen at the end of charge values, except for the voltage which continues to show the live value.

 

[hagbard]

The indicated time is the charging duration, so it would be 10 minutes from the time you started charging until Done appeared. Once Done has appeared the information in each channel is frozen at the end of charge values, except for the voltage which continues to show the live value.

You'd think I would have noticed that before. :thinking: Might just be too smart for me. :tinfoil:

 

[uk_caver]

[deleted]

 

[njet212]

Can we use C9000 to discharge alkaline or primary lithium aa to see it's actual capacity? Also what is cycle mode on C9000 function?

Some of my friend said if you not going to use your battery (Nicad dan Nimh) for extended period ( 1 month + ) it is better to completely discharged the battery before store it. Is it true?

 

[Mr Happy]

Can we use C9000 to discharge alkaline or primary lithium aa to see it's actual capacity? Also what is cycle mode on C9000 function?

Yes you can use the C9000 to measure the discharge capacity of alkaline or lithium cells. However, alkaline cells do not deliver their full capacity when discharged non-stop so you will not get the most accurate result. You can probably get a more accurate indication of capacity by looking at a manufacturer data sheet where they will have discharge curves for different kinds of load.

The cycle mode applies a programmed number of charge/discharge cycles one after the other.

Some of my friend said if you not going to use your battery (Nicad dan Nimh) for extended period ( 1 month + ) it is better to completely discharged the battery before store it. Is it true?

This can be true for traditional rechargeable batteries, but it does not seem to be very important for the new breed of low self-discharge NiMH cell.

 

[njet212]

Mr Happy, thanks for fast reply

Actually the alkaline battery i want to test is ABC Alkaline ( local brand battery ) where i can't found the data sheet on it's web.

So for LSD ( mine is old school Eneloop 1k cycles and Immedion LSD 2300 Mah ) are ok left for extended period without completely discharged them? even i left them fully charge using break-in mode ? or there is another treatment to do before store LSD for extended period?

 

[10.10.2010]

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Just finished using discharged mode for AA Alkaline on C9000. Results are 828 Mah for capacity and total time is 78 min, discharged @ 700 MaH.

Before discharged on c9000, i was try it on D11, could make the light on. After completed discharged at c9000 tried on D11 and it still make D11 on.

I'm wondering, does the discharged mode is only "test" the battery for it's actual capacity or it's completely discharged and depleted the battery?

 

[Mr Happy]

Just finished using discharged mode for AA Alkaline on C9000. Results are 828 Mah for capacity and total time is 78 min, discharged @ 700 MaH.

See what I wrote above:

However, alkaline cells do not deliver their full capacity when discharged non-stop so you will not get the most accurate result.

You have just discovered how true this is. Another way of saying this is that you may get a completely inaccurate result.

However, if you discharge at 100 mA rather than 700 mA you may get a better indication of the true capacity.

 

[Trancersteve]

Can I ask how many other C9000 owners have a loud high frequency whining sound during the charging process?

I have owned my C9000 for a few years now and have been putting up with this annoying sound, but it has been annoying me so much lately that I have banished my C9000 to the spare room when charging.

 

[noisebeam]

All 'good' chargers I've had make the noise. Mine is in the laundry room.

 

[Mr Happy]

Luckily, when you get older your ears become less sensitive to high pitched whistling sounds and the C9000 is blissfully quiet

 

[Trancersteve]

Luckily, when you get older your ears become less sensitive to high pitched whistling sounds and the C9000 is blissfully quiet

I have heard this noise in quite a few devices but the C9000 takes the crown for being the loudest.

The funny thing is my hearing isn't that great to start with.

Well it is good to know that my C9000 is not unique with this annoying noise.

 

[fishinfool]

Luckily, when you get older your ears become less sensitive to high pitched whistling sounds and the C9000 is blissfully quiet

I have 2 c9000's and I haven't noticed any noise coming from them but the 'always on' bright led display bothers me at night though. So I guess that means that my hearing is shot.

 

[Meku]

I have 2 c9000's and I haven't noticed any noise coming from them but the 'always on' bright led display bothers me at night though. So I guess that means that my hearing is shot.

My ears should be fine and I do hear the faint high pitch sound of c9000 but honestly it fades into all the background noise. If the sound is loud then there is good chance there is something wrong with the unit.

If I want to know whats going on while charging I set up mine in the kitchen next to a fridge so the sound of the fridge covers the sound of the C9000. The only thing that I find bit odd is the "always on" back light of the screen. I really don't understand why there isn't a timer to turn it off.

 

[fishinfool]

The only thing that I find bit odd is the "always on" back light of the screen. I really don't understand why there isn't a timer to turn it off.

Hopefully a backlight timer comes with the next generation of c9000's plus an on/off switch would be a nice addition also. :thumbsup:

 

[Mr Happy]

I have 2 c9000's and I haven't noticed any noise coming from them but the 'always on' bright led display bothers me at night though. So I guess that means that my hearing is shot.

Maybe there is some variation between samples. With my C9000 I can hear it if I am close to it, but from a few feet away it is inaudible, much quieter than a ticking watch. I find the beep-beep-beep sound a convenient confirmation that it is working.

As for the backlight, I guess this depends on the kind of owner. For the younger person, whose bedroom is also their living space, I can see it being an issue. For others, who have studies or workshops to put their C9000 in, the backlight is not a problem.

 

[fishinfool]

I find the beep-beep-beep sound a convenient confirmation that it is working.

There's a beep-beep-beep-sound? Really? OMG, I must be going deaf!

 

[Mr Happy]

There's a beep-beep-beep-sound? Really? OMG, I must be going deaf!

I've heard the newer ones are quieter than the earlier models. But yes indeed, the C9000 goes beeeep-pause-beeeep-pause... when it's charging.