The Blues have won just one of their six home domestic league and cup matches since Rafael Benitez took over as the club's manager in November.
Their latest setback came on Wednesday night when they let slip a 2-0 lead against Southampton to draw 2-2 and Ba has insisted that he and his teammates need to increase their strike ratio in their home matches.
He told Chelsea TV: "It's different when teams come here because they just want to defend and don't want to lose.
"When we go away, the opponents always look to take their chances and they think they can win at home. That's why the games are always more open when we play away, but at home we need to get back to winning ways.
"We had some good moments against Southampton, but some bad ones as well. They were lucky to only go in at half time 2-0 down because it could have been more, but we need to finish all the chances we have and put the ball in the back of the net.
Ba has scored three goals in four games for Chelsea since he joined the club earlier this month.