Its not that simple ;-{
Lithium Ion batteries can’t support a flat charge, you risk damaging the battery and your device.
Its best to just replace your charger if its damaged. Apple now allows other USB-C chargers to charge their systems but you still need to be careful! Make sure it’s an approved charger and offers enough wattage for your system.
USB-C opens up some new options for people! For years we needed an Apple charger as there just wasn’t any other way (the knockoff chargers people have tried ended up damaging their systems!)
Apple now allows other USB-C methods to charge their systems but you still need to be careful!
Here’s a good write up on backup batteries [https://www.macrumors.com/guide/usb-c-battery-packs/|High-Capacity USB-C Battery Pack Comparison and Review] These will charge your system via a DC connection. If that’s the direction you want to go with.