I've had the SE a few days now and the battery life on this is a lot better than what it was on my S10e, which has a 3100mah battery.
End of my work day my S10e would be around 40% battery, the SE I'm coming home with around 70%.
I think the biggest problem with the S10e is that it suffered from having both poor signal where i live, & 4G drain was the main reason i got rid of it.
The SE on the other hand has a decent signal at home not had a single dropped call as of yet using it, where as the S10e would drop calls at least once during conversation.