# Unsolvable 5-Band contrary color band sequence!

I am beyond puzzled with identifying the values of a wire wound, axial, through hole resistor that I'm replacing on a MRC Super Brain 989 relic that I burnt up after 50+ hours of charge/discharge cycles of (20) 6-cell NiMH battery sticks that make up the IMA battery in my Honda Civic Hybrid; in efforts to rebalance the pack.

The failed resistor, or actually a series of (4) identical resistors are responsible for the 10A discharge rate the 989 is capable of. I was pushing the discharge circuit beyond limits with dozens of discharges on these sticks at a 10A discharge rate at a 0.9mV/cell peak cut-off, resulting in a 6180mAh discharge capacity per stick.

The charger pauses the discharge cycle when the internal temp reaches 185ºF and resumes discharge when temp drops to 175ºF. This pause/resume would happen several times during a discharge.

All that being said....The resistors in need of replacing measure 17mm in can length and 6mm in diameter, and all 4 resistors read out on a MM with a resistance value of 0.5-0.7 Ohms.

*****THE 5-BAND COLOR SEQUENCE******

{ |BROWN| |BLACK| |SILVER| |RED| |BLACK| }

The best I can come up with is: (0.1 Ohm with 2% Tolerance) by ignoring the ending black band and treating this as a 4-Band Resistor.

The goal is to replace the resistors with a better grade, add more fans, and extend heat sink to get the charger in a workable condition to finish the project at hand.

Thanks!!

g8.jpg

• Post a picture of the resistor – BeB00 Jun 28 '18 at 22:37
• Why wear them out even further?! use pulse charge over Cv with an inductor from float charge CV or get a 100W Panel mount 0.6 Ohm resistor – Tony Stewart Sunnyskyguy EE75 Jun 28 '18 at 22:44
• there is a discrepancy between your color list and the picture – jsotola Jun 29 '18 at 1:54
• "...all 4 resistors read out on a MM with a resistance value of 0.5-0.7 Ohms" - are you saying that each resistor measures 0.5-.07 Ohms? What reading do you get with a dead short? – Bruce Abbott Jun 29 '18 at 2:27
• If the center band is intended to be white, you would have 29 Ohms +\- 1%. It doesn’t look white to me, but maybe they thought off-white would show better? – Blair Fonville Jun 29 '18 at 3:05

Looks like a 0.1$\Omega$ 2% resistor, so 4 in parallel would be 0.025 ohms.