Originally Posted by
SlimAgainSoon
What are 18650s -- I've never heard of them?
Do they fit in standard chargers, or do they require something special?
And what does "regulated" mean?
Lithium Ion batteries, you need a special charger for them.
Regulated means they are protected from overcharging and from being overly discharged. Definitely buy the regulated ones, they are a bit more, but they are safer.
Overcharging lithium ion batteries can lead to fires.
They should not be left unattended when charging.