Battery

https://www.google.com.tw/url?sa=t&rct=j&q=&esrc=s&source=web&cd=22&cad=rja&uact=8&ved=0ahUKEwiy6JyU0MzOAhXDVZQKHU3TAsk4FBAWCB0wAQ&url=http%3A%2F%2Fteacher.yuntech.edu.tw%2Fkuopy%2F%25E9%259B%25BB%25E6%25B1%25A0%25E8%2588%2587%25E9%259B%25BB%25E6%25BA%2590%25E7%25AE%25A1%25E7%2590%2586%25E7%25B3%25BB%25E7%25B5%25B1%2FBattery%2520Charge.ppt&usg=AFQjCNFTkhRlFuZ1da8RYgZpxJ9OjIM-pA&sig2=sPja2x6RXRffDYuY_hM56g