I purchesed vivo v5 in last month.My Vivo would also experience the same if I use my smartphone for gaming nonstop while it is being charged . But, if I let it standly and just several times see if the smartphone receives notifications or messages or email etc, the charging time usually up to almost 3 hours in condition I charge it when the battery life is under 30% or above 20% . When the battery life is under 20% or less than 16% for example, the charging time can up to 3 hours and several minutes. Iuse vivo v5, camera, music, performence, are good . I like the fast unlock screen and long losting battery, and also its fast performence for messaging, texting and multitask, but the battery charging is slow . But I really like vivi v5 .