Docosapentaenoic acid (DPA) is a long-chain polyunsaturated omega-3 fatty acid. It is an intermediary in omega-3 fatty acid synthesis, occurring between production of more well-known omega-3s: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).
Battery ventilation is vital â summary . There are no legally enforceable (RV) standards in this area. This article can thus only state that battery makers stress battery ventilation is vital. Some explain why. There is little or no risk if batteries are housed in well vented enclosures. With sealed batteries the risk is not high. It exists however if they are within (say) a closed bed base that traps gas. Eliminating this risk consist of little more than cutting slots, or drilling holes. So why not do it? Battery ventilation is vital â Further information
The battery is a DC (direct current) device as it produces  unidirectional current flow.    A charger is a device that produces a DC voltage. We usually think  of this device as being plugged into an AC source (like a wall  outlet). The voltage it produces is slightly higher than that of  the battery it is designed to charge. All we need to do is hook the  charger up to the battery and the battery charges.