I would like to sell my MSI GT702QD (GTX970). It has 2x128 SSDs, i would say condition is fair, no surface or keyboard scratches but some visible wear. The battery is weak (1-2 hours of light use, 40 mins of gaming). Would buying a new battery be cost effective for selling? Charger/adapter is in very good condition. How much would this be worth? I bought this in 2015 and took very good care of it. Also would Ebay be the best place to sell it ?