What problems see from the picture
It won’t charge and turn on my MacBook Air 2020
Because battery connection is corroded?
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This looks pretty normal to me. What looks like liquid is leftover flux from the manufacturing process. It's not unusual to see on these larger blobs of solder. And those two large solder blobs look like that on most other MacBook Airs I have seen.
Does the machine turn on if you unplug the battery? If it does not, battery is likely not your issue. I would try unplugging the trackpad next. and see if that makes a difference.
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After removing the battery, is it safe to put it back in without tape?
(MacBook Air 2020)
@peach40776 Safe for testing, and there are some screws that hold it in place, but I would recommend installing new adhesive once you figure out the issue.
The battery is quite thin and screws are only present along the outer edges, so the tape helps to keep it in place.
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Did you spill anything on or near the machine?
crwdns2934271:0crwdnd2934271:0 Jesse Hooton crwdne2934271:0
I didn’t spill anything
crwdns2934271:0crwdnd2934271:0 Peach crwdne2934271:0