Can I charge new Apple Watch 10 with old magnetic cables?

Yes. It is completely possible to use the older mag-cables from previous Apple Watch Generations on newer ones. The only downside to doing this, is that it will charge slower. I used the cable that came with my Series 8 on my Series 10 and I could notice the difference between the one that came with it and the older one.

Yep, just the fast charging feature won't work with older models of the charging puck

Yes. Works just fine. I still use a charger from my first generation watch with my Watch 10.

aleraffa wrote:

Is it possible to use old magnetic cables (from Apple Watch 3) to charge newer models such as Apple Watch 10? Thanks for the help.

KiltedTim is correct. The only difference in the cable is what's on the opposite end. The earlier cables had a USB-A end. The new ones have USB-C.

There is no issue.

The old cables are USB A and the new ones are USB C

With USB C you can push through more power than with USB A

The charging blocks are also different.