No, battery of ZenFone Max (ZC550KL) is unremovable. Below image compares how back part looks like with battery when the backcase is removed from the phone.
ZenFone Max (ZC550KL) : Battery is designed as unremovable one, shown as left one.
Other models of Zenfone : The battery notch at the bottom part is designed for removing/replacing the phone battery, shown as the right one
As the image shows below, battery of ZenFone Max is fixed to both sides of frame so users cannot remove and replace it on their own.
Please do not forcedly take out and remove the battery by any tool in case the phone body part and battery are damaged.