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Please tell me what the difference is.
a) Have solar batteries been put into practical use?
b) Have solar batteries been put into practice?

Thanks in advance. Emotion: smile
Kamo
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There seems to be a subtle difference.

a) SBs have been put into applications that benefit human kind. I.e. powering a city bus.

b) SBs have gotten past theory; a working prototype has been made.
Comments  
Thank you very much, Mr. Smith.
Now I think I know the difference.
KamoEmotion: big smile