First a 85Watt unit is too much for your system you need a [https://www.apple.com/shop/product/MD592LL/A/apple-45w-magsafe-2-power-adapter-for-macbook-air?|45W MagSafe 2 Power Adapter for MacBook Air***]*** It also sounds like you have a deeper issue with either the [product|IF108-011] or within the charging logic in the main logic board.
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First a 85Watt unit is too much for your system you need a [link|https://www.apple.com/shop/product/MD592LL/A/apple-45w-magsafe-2-power-adapter-for-macbook-air?|45W MagSafe 2 Power Adapter for MacBook Air]. It also sounds like you have a deeper issue with either the [product|IF108-011] or within the charging logic in the main logic board.
For now lets get a good set of pictures of the I/O board so we can check the contacts and look for corrosion [guide|21499]. Follow this guide [guide|4392]
First a 85Watt unit is too much for your system you need a [https://www.apple.com/shop/product/MD592LL/A/apple-45w-magsafe-2-power-adapter-for-macbook-air?|45W MagSafe 2 Power Adapter for MacBook Air***]*** It also sounds like you have a deeper issue with either the [product|IF108-011] or within the charging logic in the main logic board.
For now lets get a good set of pictures of the I/O board so we can check the contacts and look for corrosion [guide|21499]. Follow this guide [guide|4392]