Some reasons of capacity loss during long term storage of MH/Ni batteries were analysed and the relevant improvements were put forward .

Through analysis and calculation of experimental viscosity - temperature curve of white tiger crude oil, it was concluded that the lowest crude oil storage temperature should not be simply set at 10-15℃ above freezing point,and both security (no solidification,pump can suck in itself) and economy (low storage temperature, decrease of light compone.