I hear hissing noise from the battery when charging, is that normal?
我听到充电时，电池发出“丝丝”的叫声，正常吗？
It is normal that the battery might be hot when charging.
充电时可能电池有些发热，属正常现象。
Is it normal for the batteries to get warm during charging?
充电过程中电池温度升高正常嘛？
Is it normal for the batteries to get warm during charging?
充电过程中电池温度升高正常嘛？
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