Lithiun Ion Battery Caution

I try no to leave any charging system alone, ever, but especially on my cordless products.

That said, Having seen what Litium does when exposed to the moisture in the air, I try not to buy lithium batteries at all. I can just imagine a cracked battery in a car accident, when coolant or washer fluid gets on it. That's why lithium batteries are sealed in aluminum foil: To seal them from oxygen and moisture. One wee leak in the foil and...