LG Q6 Plus has 3000 mAh Li-Ion battery which offers talk time of about 16 hours and standby time of about 200 hours.
LG Q6 Plus has 5.5 Inch Full HD+ FullVision display which offers 493 PPI display resolution. LG G6 Plus also has Corning Gorilla Glass protection.
Yes, you can change fonts in LG Q6 Plus.
Yes, LG Q6 Plus does have the ViLTE support and you can make video calls.