... silicon,lead-acid battery,maintenance-free,low comsuption, intelligent light control 1) It adopts design with high illuminace ... It can last more 3-5tims longer than tranditional light. Battery, Extra energy reserved fro 3-5 consecutive ... lead acid battery, maintenance-freelife span: 3-5 yearsControllerAutomatically light control, overcharge and over discharge protection, constant flow drivinglife ...