MBP with almost full battery switches off if Magsafe removed.

I have an older MacbookPro (2.16ghz Intel Core, 17") . Its started behaving bizzarely today - with Magsafe connected, its shwoing a green light, and the battery is showing as 91% full, and not charging.
Checking the health settings on System Info shows its in pretty good shape.
The instant i remove the Magsafe connector, the Mac shuts off. No warning, just instant shut off.
I have reset the SMU following apples procedure of removing battery and power, holding power button for 5 secs before reconnecting everything and rebooting.
Nothing seems to have changed - the battery still refuses to charge and the Mac dies if the magsafe is removed.
Any ideas what the problem could be?
or how to cure it?
thanks

thanks, i'll have a look, but i've never noticed an option to prevent charging, or to switch off when magsafe is disconnected.
What do you think i should be looking for?

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MBP with almost full battery switches off if Magsafe removed.

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