reserve battery meaning in Chinese

备用电池
贮备电池

The advent of nanograss offered the possibility of making reserve batteries far easier to miniaturize
奈米草的构想出现之后，将储备电池缩小的可能性也随之萌芽。
Universal cheapness flash rom memory , dispense with reserving batteries , after the electricity cut off it will be permanent maintenance
通用价廉flash rom内存，无需备用电池，断电后永久保存