A little while ago, I purchased an A-grade model of the same device with 100% battery and was very satisfied. This time, I urgently needed to buy one for a family member, and when I chose based on the desired model, color, and battery capacity, only B-grade models with 90-99% battery were in stock. I was anxious until it arrived. However, when the product arrived and I checked it, there were no scratches at all, and the battery was 100%. It was no different from an A-grade (lol). I'm not an agent for Back Market, but it comes with a 1-year warranty, and I think it's a company you can buy from with peace of mind. I won't know for sure until I've used it for a few years, but it seems Back Market will be my only choice next time too. Thank you for two consecutive good products this time.