Just as already for conventional lead–acid batteries with
liquid electrolyte, where optimum battery designs for the
various applications have evolved with optimized separators,
so also for VRLA batteries different requirement
profiles demand special separator characteristics. The recent
developments have shown strengths, but also weaknesses
for the existing separation systems and thus have
given impetus to intensive further development. Probably
none of the alternatives presented here will displace any
other completely; on the contrary, they will be forced to
compete in ever optimized versions for the various applications.
It certainly will remain interesting!