Which of the following is not a characteristic of recombinant batteries?

Recombinant batteries are known for their sealed construction and specific design features that reduce the need for maintenance compared to traditional batteries. One of the primary benefits of these batteries is their ability to convert gases back into water during the charging process. This characteristic minimizes the loss of electrolyte, allowing the battery to operate efficiently without requiring regular addition of water.

In this context, the distinction lies in the fact that a characteristic of recombinant batteries is that they do not necessitate frequent water addition, setting them apart from conventional flooded lead-acid batteries which indeed require periodic checking and refilling of water. Therefore, low maintenance is a significant advantage of recombinant batteries, highlighting the fact that they are designed to operate effectively without the same level of upkeep as traditional battery types.