Audiophilepure

https://www.stereophile.com/content/stromtank-s-4000-propower-mk-ii-xt-computer-controlled-battery-power-source

I conducted three listening sessions, solo and with friends, going back and forth between pure Stromtank power and pure wall power. By the end of the longest listening session, I’d lost a pound moving six amplifiers back and forth.

Shortly after completing those tests, another issue arose. Nothing the folks in Germany tried could address a soft buzz that slowly grew from silence to an audible peak before buzzing down to silence, then repeating. Also, the unit would not recharge until it had discharged completely, and the row of LED charging indicators did not function properly. No amount of long-distance or on-site finagling could solve those problems.

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