How to clean the battery and charger of a cordless power tool?

	Use a soft brush to remove dust and debris from the battery and charger contacts of the cordless power tool. Dust can damage the connection between the charger, battery and cordless power tool, reducing their performance. It is also a fire hazard.
	It is also necessary to remove dust from the cooling holes of the charger. It is important that the charger is able to cool the battery while charging, otherwise it will increase the time it takes to charge the battery and may damage the battery.
	Before cleaning the charger, unplug it from the mains to prevent the charger from short circuiting due to accidentally connecting the two terminals (positive and negative) together. Similarly, don't use a metal brush to clean battery contacts for the same reason.
How to clean rusty contacts
	The contacts may corrode if the battery is left in the charger or cordless power tool during storage, or if it has been exposed to harsh conditions.
	When cleaning the charger or cordless power tool, follow the instructions below. If you need to clean the battery contacts, extra care must be taken to avoid short circuiting the battery. You can do this by very thoroughly cleaning and drying each contact in turn, instead of cleaning them all at the same time. If you are concerned, have the battery serviced instead.
	Step 1 - Remove the electrical lead Unplug the charger and remove the battery from the charger or cordless power tool.
	Step 2 - Clean the Contacts with Vinegar Use a cotton swab dipped in vinegar (any will do) to rub the corrosion on the contacts until the corrosion is loosened and the metal underneath is polished.
	Step 3 - Clean the contacts with water Rinse off the vinegar with clean water using another Q-tip. Vinegar is an acid, so it must be carefully removed, otherwise it corrodes the contacts themselves.
	Step 4 - Dry the contacts Air dry the contacts or use a hair dryer. It is important that they are completely dry before using the device again.