Charging at any time have no effect on the battery. Provides great performance at an excellent price. The item "9 x 12V Lithium-Ion Replacement Battery for Milwaukee 12 Volt Drill Power Tools" is in sale since Wednesday, April 12, 2017. This item is in the category "Home & Garden\Tools\Power Tools\Batteries & Chargers".The seller is "cjcmall" and is located in Ontario, California. This item can be shipped to United States, Canada.