I have grinded clementines, pineapple (like Main), frozen berries and had no situation. We are working with it day by day for about two months. Battery existence is extensive and we've not professional leakage even though we haven't taken it out and just thrown in my backpack [Safty Style and http://messiahjlifa.thezenweb.com/USB-Rechargeable-Smoothie-Blender-for-Dummies-38253079