Another electrical item often not considered are replacement rechargeable batteries. There are risks of buying such batteries online from unknown sellers, such as those through eBay. I raised the problem here:
With the proliferation of battery run devices, there is the temptation is to buy a cheap non-OEM (original equipment manufacturer) replacement to save some dosh. It can be dangerous buying from unknown sellers as there is a high risk that the batteries could fail, damage the device they are used in and lead to injury/fires.
Like mains connected electrical components which you have raised and responded to by @markm, one also needs to be very careful on where they source replacement rechargeable batteries as there are many (unbranded/counterfeit/unknown brand) battery packs available cheaply online with dubious quality.
If one buys online through selling platforms like eBay etc, there may be little recourse when something does go wrong.
