Is replacement battery for the se first generation &

Greetings,

No, according to Apple Website the original Apple watch SE the model you have is either a 2351 40mm or the 2352 44mm.

That being the case the battery I found on Ifixit that matches those model numbers is located here.

Apple Watch (40 mm SE and Series 5) Battery

Please verify for yourself that the model numbers I have found from apple are correct and visit the link above to purchase if everything lines up.

From Apples Website It also shows you in the watch application on your phone the exact model number.

Hope this helps, Monte

To learn which Apple Watch you have, use its model number:

1. Open the Apple Watch app on your iPhone.
2. Tap the My Watch tab, then tap General > About.
3. Find the Model field. You should see the part number that begins with "M."
4. Tap the Model field. You should see the field update to show a five-digit number that begins with "A." This is your model number.
5. Compare your model number to the ones below.

In Japan, if you have an Apple Watch Series 2 and the part number ends with "J/A," you can use Apple Pay on your device to ride transit and make purchases in stores.

Apple Link for verification

To find your case size and more information, check the engraving on the back of your Apple Watch.

40mm case (Model: A2351)
44mm case (Model: A2352)
Space gray, gold, or silver aluminum
Ion-X glass, Retina display, and ceramic back

40mm case (Model: A2351)
44mm case (Model: A2352)
Space gray or silver aluminum
Ion-X glass, sapphire crystal, Retina display, and ceramic back with Nike logo

40mm case (Model: A2353 North America; A2355 Europe, Asia Pacific, and China mainland)
44mm case (Model: A2354 North America; A2356 Europe, Asia Pacific, and China mainland)
Space gray, gold, or silver aluminum with a red ring on the Digital Crown
Ion-X glass, sapphire crystal, Retina display, and ceramic back

40mm case (Model: A2353 North America; A2355 Europe, Asia Pacific, and China mainland)
44mm case (Model: A2354 North America; A2356 Europe, Asia Pacific, and China mainland)
Space gray or silver aluminum with a red ring on the Digital Crown
Ion-X glass, sapphire crystal, Retina display, and ceramic back with Nike logo