Are generic batteries for 40v Greenworks lawnmower any good?

Review of generic battery for 40v Greenworks
Product link (Larger capacity 8ah version):
amzn.to/439tmPV

[@richardalexander5758]

I'm doing the same thing with an 80V Greenworks mower. Thanks for the input.

[@mikeb8342]

"What's the worst that could happen?"
A low quality battery might catch fire while using...... or even worse while charging (burning your garage or house down). Never fully trust any lithium based battery, but especially keep an eye on cheap knockoffs. Good luck.