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The John East preamp club

I'm joining the club - ordered a Uni-Pre 3 for a custom bass a luthier friend is going to build for me.
I've forgotten to share this link:

 
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Versatile but a tight fit.
Few months ago, I bought a Uni-Pre 5 from John. I love these units, but it appears that the blend circuit board has failed shortly after...bummer! It was a very tight fit in the cavity of my Roscoe SKB5, so I decided put in a 4 band Mike Pope FlexCore as the circuit boards are much smaller. Very impressed with the sound and flexibility. By no means will this deter me from more Uni-Pres in the future, but I now know I have an alternative for small cavity basses. I suppose I'll use the failed unit for parts or something.
 
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Can anyone please advise how long their battery lasts in their MM 3 band pre?

All 4 of my basses are active however I seem to have to change the battery in my East pre a lot compared with my other basses.
The usual first comment is - are you removing the cable when not playing?

Also - can you define "a lot"?
 
The usual first comment is - are you removing the cable when not playing?

Also - can you define "a lot"?

Yes, and I do get a bit paranoid about leaving the cable connected.

I would say that with the bass fitted with the John East MM Pre I am changing the battery about every 3 months, however may I add that I do not always use this bass as I have 3 other active basses which I gig with.
 
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3 months does seem a bit short. You should be able to get around a year, more or less.

Next obvious thing to check - is the battery negative terminal connected to the ring or the sleeve of the jack? Should be the sleeve.
 
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Not a MM, but my go to bass is nearly 2 years on the same battery and I play it a lot so I'd suggest 6months min on a battery...1 yr decent and 2 years, very very good

It's not my experience, especially the John East MM.

I did actually discuss the issue with John East, he was very helpful in trying to sort the issue out. Initially the battery was lasting even shorter than it does now but after a wiring tweak it improved things but by all accounts the battery should last quite a lot longer than it is doing.
 
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It might also be the battery. Or the batch of batteries, if you're buying in bulk. There have been plenty of reports of sub-optimal "name brand" batteries available from the mega-retailers. If something seems cheap, that's because it usually is....
 

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