solar energy system battery / nimh battery 1,High power density, long service life, cycle life is superior, 2,Optimization design of air duct, uniform heat dissipation, high efficiency, high safety with protection against over-charge and over-discharge，Strong shockproof ability; 3,Battery system internal connection is persistent and reliable, low internal resistance, allows large current discharge; 4,Single battery used the PP base material plastic , with good strength and high & low temperature resistance 5,Using multiple patent design.