On Sat, 03 Oct 2009 06:35:31 -0700, Jeff Liebermann
wrote:

Rhetorical question:
Why don't UPS manufacturers use Li-Ion batteries?

Not-so-rhetorical answer: Cost. SLA's are cheaper commodities and
also require less attention (cost) to safety aspects. Weight and
kJ/kg don't matter in a UPS.

Rhetorical question: Why don't UPS manufacturers use a decent
charging circuit in their SLA-backed UPS's?