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On Friday, March 13, 2015 at 2:41:53 PM UTC, Muddymike wrote:
Any comments on this scenario please chaps?

I went to the place where I do the garden, put the lawn mower battery on
my charger, then went off to do other stuff for an hour or two.

Funny thing: when I connected the charger, it stuttered about a bit
showing "charging" (orange light in this case) then "fully charged
(green).

Since the mower's been idle all winter, I knew the battery couldn't
*really* be charged; it wouldn't even cough when I tried the starter
before connecting the charger. And so I left it at green, thinking it
would "sort itself out" -- I was in a hurry to get started on my other
tasks.

After an hour I came back: light on green; disconnected charger; tried
the engine: it coughed, then stopped; no further attempt at coughing:
battery obviously dead.

I connected the charger again and this time it stayed at orange
("charging"), implying that it might get properly charged this time! Had
to leave it though because the mower's not in a place where I can leave
the battery charging and me not there.

Any suggestions as to what happened here? Why did (nay: could) the
charger say "fully charged" when first connected?

Can you get your vehicle neat it?

If so hook them together with jump leads, leave the leads on with vehicle
engine running for 10 mins, then start it whilst still connected. The
extra
oomph of the vehicle alternator charging it may help bring the battery
back
to life, but at least the mower will be started.

Mike

or push start it. An alternator doesnt provide any extra charge voltage.

No extra voltage but is a very stupid charger in the sense that
it doesn't try to decide if the lawnmower battery is charged or not.