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› Help charging Sanyo 2500mAh AA's!!!!
02-08-2006 08:12 AM  12 years agoPost 1
Logieberra

rrApprentice

Canberra, Australia

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Hi guys,

I hope that some one can help, it is off topic but relates to chargers that I use for my T-Rex.

I need to charge 10 x Sanyo AA batteries for my Meade Telescope and I am having one hell of a time using my Schulze ISL6-330DE and Swallow Digital chargers to get the job done.

I have tried to charge the cells in series in those cheap plastic battery boxes that you can buy from electronics places but they're not charging as they should. For a start, the schulze on Auto D/C charges at only 0.3 amps. Also, should it not automatically detect the number of cells, seems that it is always off, like 6 or 7 it sometimes reads. Would these charges have trouble detecing necessary voltages because of the way the box is wired? What is the best way to charge these individual AA's? Someone said that I need to get tin and solder them in series, but what a pain!!!
As for the swallow charger, it worked ok but did not stop after putting back 2500, they began to get darn hot!!!

I realise that this is confusing and off topic but I would really appreciate info from you experienced AA chargers out there

Regards.

Logan.

Tip of the Day: ADDICTION? "Buy Align case, lock it up, hand over key."

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02-08-2006 12:55 PM  12 years agoPost 2
z11355

rrMaster

New England

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those cells have a max. charge rate of 1.1A.

most likely, the cheap plastic cradle w/ thin wires is
confusing the Schulze (dropping too much voltage).

do this........

discharge the batteries to a terminal voltage of 1.0V each.

set the Schulze to NON peak detect charge w/ a rate of 0.25A

start a timer and take the batteries off the charger after 16 hours.

repeat the discharge and charge cycle two more time.

NiMH batteries have to be slow charged the first few times used.

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02-08-2006 06:14 PM  12 years agoPost 3
robl45

rrKey Veteran

Deerfield Beach, FL

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I don't know why yours isn't working. I have charged AA's on my chargers with the cheap plastic box that went in my transmitter and it worked fine. Maybe check the voltage coming out of the battery box. Maybe something is weird.

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02-09-2006 06:51 AM  12 years agoPost 4
Logieberra

rrApprentice

Canberra, Australia

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1. Discharge the batteries to a terminal voltage of 1.0V each.
I am not quite sure how to do this on the schulze, is it possible and if so how?

2. Set the Schulze to NON peak detect charge w/ a rate of 0.25A
I will look at the manual for NON peak detect but at this moment I have no idea how to do this, any suggestions?

3. Start a timer and take the batteries off the charger after 16 hours. How many mAh will this put back into 10 x 2500mAh AA's?

4. Repeat the discharge and charge cycle two more time. Gotcha, if I can do the above this should be easy.

NiMH batteries have to be slow charged the first few times used.
Ok.

5. Maybe check the voltage coming out of the battery box. Maybe something is weird. I will buy one of those cheap $10.00 digital tests and tell you what the pack is giving out, dumb question but on a full charge it should be 12V to match the mains power cable that I normally use, however, if the batteries are partially used will this read lower? Or will the voltage remain pretty much the same, around 12V until empty? Sorry, have no idea about this stuff.

Thanks guys, can you please continue to help me with this problem, I will do what I can and report back.

Much appreciated.

Logan.

Tip of the Day: ADDICTION? "Buy Align case, lock it up, hand over key."

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02-13-2006 09:07 PM  12 years agoPost 5
Logieberra

rrApprentice

Canberra, Australia

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Ok, problem solved, hope this helps someone

Instead of using the $300.00 Schulze charger that shuts off automatically after 4+ hours I had success with the Swallow Digital Charger as this has no timer cutoff. I charged the 10 x Nimh batteries in a cheap plastic battery box with + and - cables on a charge rate of 0.25 amps for around 14 hours. The charger stops charging these packs when it has put back in around 2575mAh. Success.

Not so complicated after all

Slow trickle charge is the only way I have found to make it work. Run 3 x Discharge/Charge cycles to break in the cells. It takes time but this is the sure fire method.

Cheers.

Tip of the Day: ADDICTION? "Buy Align case, lock it up, hand over key."

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