Mobile for a person using first time 6-10k suggestions required

Any suggestion on 6-8k range
Only priority good battery and should not hang
For a senior person using the phone just 3 months back he started using stock android phone and so there was no problem but if now on I give him a miui phone it will be very troublesoming I think
If any good suggestion please share and any sales in coming days no bank discs at present
Only 2 requirements
Good battery life with bit fast charging if possible and better ram management
He won’t have more apps other than whatsapp YouTube jiotv at the most fb lite and one etmarkets nothing other than these 4
Can extend the budget to 10k if comfort for him will be much more than that of 6-8k phone