A variant of these types of batteries that are valve regulated and have gel electrolyte are called OPZV. These are a maintenance free variant of OPZV.
OPzV series design adopts colloidal electrolyte and tubular positive plate, and has the advantages of valve-controlled battery (maintenance-free) and open battery (floating charge/cycle life), etc.
Rechargeable GEL 2V 1000AH opzv battery for solar enegy storage
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