battery No free acid Air leakage system & Self-sealing Stable quality, high reliability Security Certification : UL ,CE ,ISO battery FeaturesSecurity sealNo free acidAir leakage system & Self-sealingLong life to useStable quality, high reliabilitySecurity Certification : UL ,CE ,ISO etc. APPLICATION: Stand-by/Back-up power application TelecommunicationsSolar powered systemElectronic switching ...