Z Power 20000mAh Portable Power Bank - Phone iPad iPhone Slightly Used Like New

Z Power 20000mAh portable power bank for phones tablets MP4 iPhone iPad. For sale power bank only no cables or boxes. Model Z Power input DC 5V 1A 2A rated 20000 mAh RoHS compliant. Slightly used tested holds charge and will charge phones and tablets multiple times depending on model. Note rated mAh is cell capacity not usable output real delivered energy is lower due to conversion efficiency roughly 60 to 70 percent so expect about 12000 to 14000 mAh usable. Compatible with USB charged phones tablets and MP4 players. Cosmetic condition light signs of use no dents no swelling unit charges to full LED indicators work. Fair market price for slightly used generic 20000 mAh power banks is about $30 to $45 I am asking $40 OBO. References include retail listings for similar capacity units and used listings on resale sites. Local pickup or shipping available will be packed securely with tracking. Typically gives 5 to 8 full phone charges or 1 tablet charge. Selling because I upgraded. Thanks.