(Topic ID: 229212)

Black Knight burns through batteries

By BShing

11 months ago

Topic Stats

  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 11 months ago by Schwaggs
  • No one calls this topic a favorite


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#1 11 months ago

I have a 1980 Black Knight that has always gone through batteries extremely fast. A good set of AA’s last about two weeks. I just recently changed the 5101 thinking the memory chip itself was doing it and no luck. The new (well replacement, I stole it from a spare Firepower board) chip didn’t solve the problem. Any ideas? I almost bought the battery replacement chip but thought that might not work until I resolve what’s doing this.

#2 11 months ago

I’m sure it’s one of the 2 diodes right by the battery back.
One of them is shorted.
Letting the power back into the battery pack making th batteries drain faster.

#3 11 months ago

According to the scematic, IC10 is also powered by the battery pack circuit. A failing chip here could also be the problem.

If you ever want to go to NVRAM, I would just replace the 5101 with an NVRAM module. Whatever is draining the batteries, is very unlikely to cause problems with the NVRAM.

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