best way to charge batteries without getting noise

thank u !

What country are you from? Maybe a 240V charger could be a cheaper option.

https://www.egopowerplusuk.com/56v-lithium-ion-30-minute-charger.html?_ga=2.176371809.539956317.1635...

But generally, if you have a noisy wall wart type of adapter putting them on a separate circuit than your audio system is a good idea

Better, but the rubbish still all ends up on the same active neutral and ground back at the fuse box. So it still gets into the the household wiring.

Best is big Isolation transformer, followed by a medical grade Siemens brick size noise filter. But not for the power amp, that has to go straight into the wall for best results from it.

Look at my thread here about it
https://forum.audiogon.com/discussions/get-the-best-from-your-system-while-listening-without-any-cos...

Cheers George

while listen music unplug battery charger
when plug in battery charger not listen music
(response in kind)

" hey i dont think u understand me my ac outlet have very bad wiring and i live in very old house..."

Errrgghh?
Get your home rewired before it and/or you go up in flames.

I'm serious.