On Mon, 19 Feb 2018 05:48:13 -0800 (PST)
wrote:

I have about six or seven park side tools which I find as very
reliable. But when it comes to my cordless drill which I must say I
really had a good number of years with good result and reliable too.
My disappointment is, while the tool is still in very good working
order, the batteries no longer keep their power more than 30 seconds
and can`t find a replacement. Any ideas.

Dismantle the battery to see what sort of generic cells it contains,
and replace them.