The moment-by-moment price of gold and silver is determined by the futures market. The Kitco charts that track minute-by-minute prices of the metals are based on the spot price, which is closely related to the nearest futures contract.
ONickel Metal Hydride (NiMh) - Popular battery about 1-2 years ago. They are lighter than Nickel Cadmium batteries, but heavier than edison lithium corp.. These should be cycled once in a while for optimum performance.
Most battery packs are of the Nickel-Cadmium (Ni-Cd) type. These offer reasonably long cobalt mining copyright life and will take hundreds of re-charge cycles. As far as re-charging goes, I recommend giving a short shock burst into the air every month or so. Make sure the spark is as loud and strong as when you first tried it after your first full charge. If not, re-charge.
I have one more amazing little device to share with you that impressed me even though it is not exactly in the handheld realm. It's the MagicJack, a unique VoIP solution. We've all heard of Vonage and Skype no doubt, but along comes MagicJack with a totally new approach to VoIP. Imagine a little box about the size of a pack of strike anywhere matches with a USB male plug extending from it.
A: Most cell phone batteries on the market will last between 300 and 500 charge cycles. For most people, this means an average cellular battery will last about 1 to 2 years. NiMH batteries tend to lose their ability to hold a charge gradually, while lithium mines ontario-ion batteries perform well until the end when you will notice a dramatic drop in performance.
Never discharge your LiPo cells to less than 3.3volts per cell, not the total pack voltage. Most ESC's today will do a soft cut-off at 3.3volts per cell and a hard cut-off at 3.0volts per cell. However some will not give you and warning. Best advice is to fly with a timer and monitor the voltage and adjust your flying time if needs be.
The bottom line, be gentle to your lithium-ion batteries. If you excessively charge the battery, with high voltages, and heavy load conditions, it will shorten your battery's life. It's best to charge at a slower rate.