在一天结束的时候，他们把充满电的电池带回家。
At the end of the day, they take the charged batteries home.
每块充满电的太阳能牛奶电池可以给手机充电三到四次，或者给收音机充电一到两次。
Each fully-charged Solar Milk battery can charge a mobile phone three or four times, or a radio once or twice.
如果你确实决定来上摄影课，别忘了检查一下你的相机电池是充满电的。
If you do decide to come to the photography class, don't forget to look at your camera battery and make sure it's charged.
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