Yup, I just (As in yesterday) have had the battery in my 3 die.
You are not the only one with this problem, I heard many complains from their customers that batteries in Keystone 3 are much worse quality than in older Keystone.
That can be a problem with many new Lithium batteries, if you don't use them all the time (charge/discharge) they quickly become unusable.
It's not complicated to buy new one, but problem is that it is hard to replace the battery without triggering Keystone self-destruct mechanism
Can't anyone make anything that is not crap anymore.
They can, but it would be much more expensive and not made in China.