On Wed, 31 Oct 2007 03:43:21 -0700, wrote:

Peter Lynch wrote:
On Mon, 29 Oct 2007 20:07:00 +0000, NoSpam wrote:

I've just decided the old petrol rotary is too rusted to repair again
and, while doing some research into a replacement, have stumbled over
cordless mowers.
I'm naturally cynical about claims but the Bosch Rotak specs claim
they're OK for 400m2 of lawn on a single charge, and the Lithium-ion
batteries should last well (if they don't burst into flames :-( ) - but
has anyone actually used one? Are they any good?

Dave

Talking about the Li-ion batteries, how do these hold/deliver charge in
cold weather?
I've noticed that the batteries for my camera (also Li-ion) last a
matter of minutes when I'm using the camera at night during the
winter. Now I appreciate that you (probably :-) won't be cutting
your grass at night, but the chemistry in the cells does reduce
their capacity when they're cold. So you may find that you'll get
less grass-cutting capability in the early morning if your mower's
been kept in a cold shed overnight.

Lion would be a pretty expensive technology for a high power battery.
Output falls with lead acids too of course, at sub zero.


NT
May be expensive but being used more and more - Latest electric
outboard motor uses Lion instead of Lead Acid.

One of the claims is that Lion can be repeatedly fully discharged
without ill effects unlike Lead ACid.
Thus a Lion battery with half the capacity can be used.

Isnt one of the latest hybrid drive cars using Lion ?
Robert