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HelicopterRadio - Servo - Gyro - Gov - Batt › New Battery won't hold charge
10-09-2005 06:11 PM  12 years agoPost 1
Jetmo

rrApprentice

Macomb, Michigan

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I charge the Battery, at night I have a full charge. Get up in the AM and My Futaba Battrey Checker shows only a Half Charge.
I cycle about once a week. It's a new battrey too.

Any Ideas?

"KeepMbladesSpinning"

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10-09-2005 07:13 PM  12 years agoPost 2
Lorents

rrElite Veteran

Oslo, Norway

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Hi Jetmo,

What kind of charger do you have?
If it is a computer charger it could be a false peak detection terminating the charging process before the pack is full.



What comes around goes around.

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10-09-2005 08:35 PM  12 years agoPost 3
AirWolfRC

rrProfessor

42½ N, 83½ W

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New batteries need to be on the "wall wart" C/10 charger for at least 15 hours the first time through. If not, you will get a false peak and charge termination on any of the detecting chargers.

Wolfgang

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10-09-2005 08:44 PM  12 years agoPost 4
Jetmo

rrApprentice

Macomb, Michigan

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"wall wart" C/10
What kind of charger would do? I only have a Old digipace and the Futaba field charger.

Can I correct the battery?

"KeepMbladesSpinning"

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10-09-2005 08:55 PM  12 years agoPost 5
AirWolfRC

rrProfessor

42½ N, 83½ W

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Well, before I go any further, can you tell us what battery you're talking about ?

Wolfgang

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10-09-2005 09:04 PM  12 years agoPost 6
Jetmo

rrApprentice

Macomb, Michigan

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SR 1800ma Nicd's C cell..and thank you, I went shopping for a AC charger for my home and my LHS only had 12v chargers.

I also want it to do a good job at cycling.

Thanks!!!

"KeepMbladesSpinning"

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10-09-2005 09:13 PM  12 years agoPost 7
AirWolfRC

rrProfessor

42½ N, 83½ W

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You force me to make the assumption that you have a 4 cell pack.

If that is the case, you need to find a 4.8VDC charger that plugs in the wall and gives about 200ma. This type of charger will keep charging until you unplug it. The reason for C/10 is that rate will not kill your battery if left for long periods. Charge 15 hours with that and then do your cycling thing. If you can only find 100ma then just leave it for 30 hours but don't go over 200ma.

Wolfgang

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10-09-2005 09:18 PM  12 years agoPost 8
Jetmo

rrApprentice

Macomb, Michigan

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Ok, thanks, the digipace is no good for me then. The highest charge rate is 120ma.

Yes and sorry, it is a four cell..:

"KeepMbladesSpinning"

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10-09-2005 11:30 PM  12 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Why on earth are you cycling your batteries once a week? There is no reason to do so.

Dave

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10-10-2005 12:34 AM  12 years agoPost 10
Jetmo

rrApprentice

Macomb, Michigan

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My Futaba (CR-2000) will work just fine, it's new so I'm still learning it!

dkshema

Hehe, I'm sorry. I don't mean to say I Cycle once a week all the time. It's a new battery and I'm trying not to ruin it with my old Digipace. It only has a top charge of 120ma. I can't remember who, but I was told on RR by others that it would be no good as a regular charger. So I bought Futaba's new CR-2000. I can Charge my 1800MHA Four Cell Pack @ 1.85, does that sound right? It can go higher!
It's a DC charger and say's in the Instuctions I can hook up an AC adapter. So far I have found no way to do that. It only came with an Input cord and a plug, where I can attach the Cig lighter adapter or the Big DC aligator clips. It's nice but It's a pain lugging around my 12v Car Battery

One more question:

I'm using Futaba's BR-2000 fo Discharge the cell's. How low should I Discharge a 1800MHA Four Cell Pack?

Hope that made sence!

"KeepMbladesSpinning"

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10-10-2005 03:52 AM  12 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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I looked up the Futaba charger and discharger.

The charger is a peak-detect charger, and if the battery is healthy, then you should be able to charge at that 1.85 amp rate. The charger will detect when the cells are getting full and switch over to a lower charge current to top them off and prevent damage.

That being said, according to the manual, if the battery is new, or if the battery is old and hasn't been used for a long time, the charger may make a mistake and not shut off the high current charge in time. If the charger fails to reduce the current, and continues to pump that 1.85 amps into a fully charged pack, there is a good chance the battery will overheat, build up internal pressure in the cells, and they will vent. The top of each cell has a built-in "beer-can" type vent that if the pressure gets too high in the cell, it pops open. Along with the excess gas, some of the electrolyte also escapes. Too many of these cycles and the battery is toast.

The manual says the cure is to make sure that a new or very old pack is charged using a normal "overnight" type charger, then discharged, and this cycle repeated two or three times. The overnight charger would be one that puts out at least 180 ma to your 1800 mah pack. That 120 mah charger would work, but it would take quite awhile. Much more than overnight.

I think your charger will charge at a lesser current, so set it to charge at 180-200 ma, charge it overnight, then discharge it. Repeat the charge/discharge cycle two or three times, then try the quick charge that you had been using (1.8 amps) and watch the charger and battery pack for the next charge cycle. Make sure the charger switches to the lower rate when nearly charged, and that the battery pack doesn't get really hot. Shut it off if things go south!

To discharge, nicad manufacturers consider a nicad cell to be discharged when the voltage of the cell drops into the range of 1 to 1.1 volts. No lower than 1.0 volt per cell. So, for your 4 cell pack, the cutoff voltage should be in the range of 4 to 4.4 volts.

One thing you might want to check on the high-rate charge is the size of the wire you're using, and the length of your charging cable. Use the largest wire you can that will fit the connectors, and make it as short as possible. If the wire gauge is too small, and/or the cable you're using is too long, the voltage drop between the charger plugs and the cells may be large enough to cause the charger to "false peak" and shut down too soon when charging.

Dave

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10-10-2005 05:32 AM  12 years agoPost 12
Jetmo

rrApprentice

Macomb, Michigan

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Thank You Dave!

You have a way of making things sound Very clear! I understood everything you said. The futaba Discharger did stop at 4.0volts.

I had the setting on the bottom set between 1 and 2 amp rate. A little over the half way mark.

I will Use the older digipace and let it go for about 25 hours and check it.

Just so you know, I kept checking the battery for warm'th and never felt any when I used the new charger at 1.85a.

Thank you for all the good information.

"KeepMbladesSpinning"

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