Vivo X21s is powered by a 3400mAh. It measures 157.91 x 75.08 x 7.90 (height x width x thickness) and weighs 156.00 grams.
specs:
Display 6.41-inch
Processor octa-core
Front Camera 24.8-megapixel
Resolution 1080x2340 pixels
RAM 6GB
OS Android 8.1 Oreo
Storage 128GB
Rear Camera 12-megapixel + 5-megapixel
Battery Capacity 3400mAh