This app again is open source, available at Github and also at F-Droid, but wasn't updated since 2018. If your device is rooted, there's a third candidate to mention: Battery Charge Limit. To my knowledge, Battery Charge Notifier is not open source, so it does not fully meet your requirements.
This helps in observing the 40-80 rule of Li-ion batteries. Light weight app that notifies user at user defined battery levels to either charge the device, or to unplug and stop charging. If you prefer to set your own value, take a look at Battery Charge Notifier: Safe Charger is open source, you can find it at Github (and also in my repo). Note: It will not alert you exactly at 85%. Safe charger is an utility application which alerts you when the battery level reaches a particular range. Safe Charger promises to do exactly that:
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