[PLUG] LiFePO4 UPS?

[Keith Lofstrom]

I have an ancient Tripplite 700VA UPS, which is briefly
triggered maybe twice a year, and needs a new sealed lead
acid (SLA) battery maybe every two years.  Oh boy, more
toxic waste, and shopping trips, and disposal trips. 

Theoretically, it can provide a signal that tells my
computers to prepare for shutdown, but it doesn't seem
to play nice with Linux.  Most of the outages have been
less than 30 seconds, so triggered shutdown is not a
"must have".  However, extra bonus points if the UPS 
/does/ behave well with more than one Linux machine.

The load is two computers (250W) and perhaps one of two
screens (another 60W?).  Note that 700VA actually means
something like 400W continuously delivered - perhaps 
the VA number covers the peak impulse power at computer
startup, or during a power line excursion.

New technology LiFePO4 batteries last much longer and are
environmentally cleaner than an SLA, and are shape and
terminal compatible, but they charge differently. 
I tried one and failed.

Perhaps there is a warranty-voiding retrofit hack for the
Tripplite, but for safety's sake I prefer to purchase an
Uninterruptable Power Supply designed for LiFePO4.  

Searching on Amazon reveals some $1K units (and a crap-ton
of SLA in response to "Lithium"), more power than I need
and way more dollars than I wish to spend.  I don't mind
spending 2X, but not 5X.

Suggestions? 

Keith

-- 
Keith Lofstrom          keithl at keithl.com