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What is the best 9v battery for active basses?

I have to know.
Lithium, without doubt.
They die without warning?
Well, that's easily remedied
9up210.jpg
.
Get yourself one of these. Always carry a spare battery, too.
 
Really? The detail about 4 years makes this convincing.

It was pretty simple in the end - I got a cheap Donner tuner pedal and added a wire inside the pedal that puts the +9V power onto the ring connection of the input jack. I shorted out a 9V connector and installed it in place of the 9V battery inside the bass. I use a TRS cable between the tuner and the bass.

As long as you're bass is wired so that ground goes to sleeve, the battery ground goes to ring, and signal goes to tip, this will work. Some Ibanez basses have the ring and sleeve reversed.

The cheapest way I could find was the Donner tuner pedal - it uses TRS jacks so all that's needed is one wire. I built two breakout boxes but the parts cost more than the tuner pedal - plus you get a decent tuner out of it.

With a little bit of looking, I found some decent quality TRS instrument cables. Also, you'll need a good, quiet 9V power source.

http://www.amazon.com/gp/product/B008ZDBFIA/ref=s9_hps_bw_g23_i4
 
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It was pretty simple in the end - I got a cheap Donner tuner pedal and added a wire inside the pedal that puts the +9V power onto the ring connection of the input jack. I shorted out a 9V connector and installed it in place of the 9V battery inside the bass. I use a TRS cable between the tuner and the bass.

As long as you're bass is wired so that ground goes to sleeve, the battery ground goes to ring, and signal goes to tip, this will work. Some Ibanez basses have the ring and sleeve reversed.

The cheapest way I could find was the Donner tuner pedal - it uses TRS jacks so all that's needed is one wire. I built two breakout boxes but the parts cost more than the tuner pedal - plus you get a decent tuner out of it.

With a little bit of looking, I found some decent quality TRS instrument cables. Also, you'll need a good, quiet 9V power source.

Impressive. I am far too lazy for that. Also I don't like carrying pedals with me as a routine measure.
 
Impressive. I am far too lazy for that. Also I don't like carrying pedals with me as a routine measure.

Then batteries might be better for you. I pretty much play in one location so I don't have to move stuff around. Also, I don't like the logistics of batteries (buying, storing, disposing etc.) so this worked out well for me. I use either pedal board or a tone shaper so I've got a 9V supply around anyway.
 
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Whatever is cheapest. Because any of them will be dead overnight because I never remember to unplug after practice.

I guess I fall into the middle camp... I don't buy the very cheapest (even though a lot of people say many of the cheapos are actually the same battery made in the same factory as some of the big names), but I can't see myself paying $7 for a battery. I have a few basses, some take 2 batteries... I am not gonna put $100 into fancy batteries. And like you, there's a decent chance I'd accidentally kill them through carelessness.

I have what I call my "Expensive French Wine Principle". A number of years ago, I brought back a very very nice, expensive bottle of wine from France, saved it for years until a special occasion called for it. When I opened it, it was like vinegar. Turns out by storing on my kitchen counter above the dishwasher, which I did because I then lived in a limited space apartment, I had negligently ruined this $150 investment (and would have been a $300 bottle bottle bought state-side). Bottom line, I am now wary of making a large investment for long-term payoff. You may never get that payoff, but you will definitely be out the $.