MRC SB 989 charge issue (Full Version)

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Bent Nail -> MRC SB 989 charge issue (3/11/2008 3:38:36 PM)

Hi all, I have a 989 and I have encountered a problem charging a new transmitter battery. The NICAD battery is for a JR 10X, I had the local battery shop replace the existing cell with Sanyo cells (9.6 volts 1100 mAh). I have had success with 4.8 and 6 volt batteries but I am running into a problem with this set. I wanted to form the battery so my initial settings were .30 charge and .40 discharge.

I am connecting directly to the batteries thus bypassing the circuit board. The problem is I can discharge to 1120 mAh but can only charge about 890 to 900 mAh. I have tried 3 or 4 times adjusting the settings; this helped in the beginning but it has not improved.

Below are the last settings.

Common: NICAD, 8 cells, 1100 mAh

Discharge: .40 cutoff 1.10

Charge: .30, cutoff peak 10, trickle .10

Any ideas?

Thanks

John M.



Tim@MRC -> RE: MRC SB 989 charge issue (3/27/2008 9:36:34 PM)

Sorry John, I missed this one. Has anything changed with this? Are you still experiencing the same thing? Again, sorry I missed it, please let me know what you find.



Bent Nail -> RE: MRC SB 989 charge issue (3/27/2008 9:44:21 PM)

Hi Tim, yes I am still having problems with the 9.6 battery. I have a 6 volt cycling and it appears to be doing fine.

John M.



Tim@MRC -> RE: MRC SB 989 charge issue (3/28/2008 5:25:41 PM)

So the 6v cycles fine with similar charge/discharge ratings, but the 9.6 is still exhibiting the same symptoms?



Bent Nail -> RE: MRC SB 989 charge issue (3/28/2008 8:47:33 PM)

That is correct, although I have not tried the 9.6 in about 2+ weeks, I am in the process of cycling 3 6.0 batteries. the first completed normally and the second appears to be functioning properly.

When the receiver battery is completed I will try the 9.6 again and verify the settings that I posted. Any Ideas?

John M.



Tim@MRC -> RE: MRC SB 989 charge issue (4/2/2008 4:30:19 PM)

Have you tried increasing the charge rate to 0.5 amps, have you tried lower it to 0.2 amps?

Tim



Bent Nail -> RE: MRC SB 989 charge issue (4/9/2008 5:11:10 PM)

Hi Tim, it was good talking with you at Toledo, putting a face with the e-mail. I took your advice and tried a couple of different settings. The temperature never got above 85 degrees and the room was at 67. Below are the results.

Test 1.

Chg. .70;Cut off peak 12; Dischg. .60; Cut off V 1.00

D1 935Mah D2 1006Mah
C1 998Mah C2 997Mah.

Test 2.

Chg. .40; Cut off peak 12; Dischg. .80; Cut off V 1.00

D1 917Mah D2 976Mah
C1 923Mah C2 919Mah

Test 3.

Chg. .30; Cut off peak 10; Dischg .30 Cut off V 1.00

D1 1109Mah D2 1230Mah
C1 881Mah C2 846Mah.

I think I will go with test 3 since it gave me the best discharge. Admittedly, I cannot figure out why I can take out 1100 mAh and only charge 850 mAh+ As you said the transmitter does not have a high draw so this should be fine.

An interesting problem maybe someone will come up wit a plausible answer.

John M.



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