I am aware of the downfalls of this system, that is why my preference is still for a full shower. I do this when i feel I have too. there will be an update video when I get a "full" shower in the washroom.
here is a link to a better version of the shower that i bought. it has two batteries so the amps will be dispersed between the two and I think they should be able to handle it.
https://www.amazon.com/Portable-Handheld-Adjustment-Rechargeable-Showering/dp/B07FX1KD23/ref=mp_s_a_1_14?dchild=1&keywords=5+volt+shower&qid=1635610650&sr=8-14
showersteps.
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