On 2012-05-17 00:02, RJK wrote:
wrote in message
...
I was a huge fan of uninterruptible power supplies since the beginning
(even for laptop use). Besides the computer, you can power lots of other
things. A small lamp, cordless phones, DSL modem, alarm clock, etc. All
great of course. And I have gone through a number of UPS over the years.
Generally the battery fails after 3 to 5 years. And the batteries
generally run in the 25 to 35 buck range and they are heavy to pay for
shipping.

Lead is scrap.

Who killed the electric car? The lead battery.

I use since 1995 photovoltaic and a lead battery to power
my notebook on the beach. Same, every some years, the lead battery fails.

http://laptop.pege.org/2005-photovoltaic

I had my first electric scooter September 2006 to November 2009
17300 km and 3 sets of lead batteries complete scraped

I have since November 2009 a new electric scooter.
The battery pack was before in an other electric scooter
from January 2008.

22.000 km without a problem, so now 4 times longer service life
than lead

I will change also my photovoltaic system to
lithium iron phosphate batteries.

Less weight far longer serive life

Imagine a battery for a public transport bus.
In average 70.000 km a year stop and go traffic in a city,
every night fast charging. 10 years long.

BYD sells such buses with a 324 kWh lithium iron phosphate battery
designed for 6000 charging cycles, to work
in buses more than 10 years.

That's the ultimate challenge for battery technology.

We will see lead batteries vanishing in the next 10 years
like the CRT. When did You see a CRT last time in an shop?
--
Roland Mösl
http://www.pege.org Planetary Engineering Group Earth