What is the best 9v battery for active basses?

[fdeck]

At least a decade ago, I tested several 9V batteries by measuring their voltage as they discharged through a resistor that simulated roughly the current drawn by a preamp that shall not be named. I included some name brands and the Walgreen's store brand. There was no clear winner. I stuck with Walgreen's.

Recently, I got a couple of 9V rechargeable lithium polymer batteries from AliExpress. My intention was to use one of them and take the other apart. Since those batteries use a built-in switching voltage converter to produce 9V, I'd like to see how they affect the audio signal. I'll post results when I have them.

 

[dadglasser]

I always wanted a pre-amp that would take D cells:

I would hope that they would not let me down.

 

[jeffb28451]

I’ve never had a Duracell leak or damage anything they were in. Energizers have damaged 3 pricey remotes and a wireless system. No Energizers ever again for me. Duracells seem not to last quite as long, but that’s a small price to pay, I think.