Something about the Chemical batteries–two
Disposable batteries and rechargeable batteries
Disposable batteries are commonly known as "disposable" batteries, because after their power runs out, you can not recharge for using but only discard. Common Disposable batteries, including one-time battery alkaline batteries, zinc manganese batteries, lithium batteries, zinc batteries, zinc air batteries, zinc and mercury batteries, mercury batteries, hydrogen cells and magnesium-manganese batteries.
Rechargeable battery by making the difference in materials and workmanship, the common batteries are lead-acid batteries, nickel-cadmium batteries, nickel-iron batteries, nickel hydrogen batteries and lithium ion batteries. The advantage is a long cycle life, which can be full charged and discharged for 200 times, and some rechargeable battery power is higher than most of the load off the battery . Ordinary nickel-cadmium, nickel metal hydride battery, the unique memory effect, causing inconvenience to use and often lead to early failure.
Theory of battery charge time
Theory of battery charge time: the battery charger power divides by the output current.
Example: take a battery 800MAH battery for the example, the charger output current is 500MA then charging time is equivalent to 800MAH/500MA = 1.6 hours, when the charger shows charging is completed, the battery still need about half an hour for the complement of electric time.