Apple watch 1 charging not compatible even with original charger!!

From your description, it seems likely that the battery fell into deep discharge state during storage and is not now capable of properly holding a charge:

Batteries - Maximizing Performance - Apple

I suggest that you contact Apple Support (mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider to arrange for your Apple Watch to be checked and to establish your available service options:

• US: Apple Watch Service Answer Center - Apple Support
• Elsewhere: Apple - Support

If Apple determines that battery service is required and your Apple Watch is no longer covered under warranty, then chargeable battery service may be available. In the US, for example, this currently costs $79 plus tax and, if required, shipping:

Apple Watch Service Pricing - Apple Support

If you instead wish to dispose of the Apple Watch, then it can be handed in to any Apple Retail Store for recycling.

Hi

Follow the instructions here, if necessary including contacting Apple Support (remote diagnostics and/or mail-in service may be available, if required), making a Genius Bar reservation or visiting an Apple Authorised Service Provider with a view to having your Apple Watch and cable checked under warranty:

• Check your battery and charge your Apple Watch - Apple Support
• If your Apple Watch won't charge or it won't turn on - Apple Support

Be sure to use only an Apple or MFi-certified USB power adapter or third-party accessory in conjunction with the supplied Magnetic Charging Cable when charging your Apple Watch.

If you are already doing so, then try using another such power adapter and, if possible, testing by using another Apple Watch Magnetic Charging Cable if you have access to one (perhaps by borrowing it).

(Note that you are not talking to Apple here - this is a user-based technical support community).

Hello,

Get help

If your Apple Watch won't charge or you see a message on your watch that charging with this accessory isn't supported:

1. Make sure that you plug the Apple Magnetic Charging Cable all the way into the USB Power Adapter, then make sure that you plug the adapter all the way into a power outlet.
2. Make sure that you're using the Apple Magnetic Charging Cable and the USB Power Adapter that came with your Apple Watch.
3. Completely remove any plastic wrap from both sides of the charger.
   
4. Make sure that the back of your Apple Watch and the magnetic charger are clean.
5. Position the back of your Apple Watch on the charger. The charger's magnets align your Apple Watch, and you should see on the watch face.
6. If your Apple Watch still won't charge, force it to restart. Press and hold both the side button and Digital Crown for at least 10 seconds, or until you see the Apple logo.
7. Try a different Apple Watch Magnetic Charging Cable and a different USB Power Adapter. If your Apple Watch is out of power, you might need to wait a few minutes for to appear after you start charging your device.

If you still need help, contact Apple Support.

Taken from:

If your Apple Watch won't charge or it won't turn on - Apple Support

You're welcome!

You had not previously advised that the warranty has expired.

If by "Apple Watch 1" you are referring to either an Apple Watch (1st generation) or to a Series 1 model that is no longer covered under Apple's Limited Warranty, rather than to a new Apple Watch Series 1 (which is still sold "brand new" by Apple), then your Apple Watch may be eligible, if required, for chargeable, out-of-warranty service.

I suggest that you proceed with contacting Apple Support or making a Genius Bar reservation in order to establish your available service options.

Keep in mind that, if the Apple Watch has previously been in storage for long enough that the warranty has already expired, then it may now have impaired battery performance.

Apple advises that, when storing Apple Watch long term, it should be stored it with a 50% charge and then recharged to 50% every six months. See under the heading "Store it half-charged when you store it long term":

Batteries - Maximizing Performance - Apple

More information:

Identify your Apple Watch - Apple Support