The Nikon MH-25 Quick Charger comes with the Nikon D800 and is used to recharge the EN-EL15 battery. This charger is also included with the Nikon D7000 and Nikon 1 V1 cameras (they share the same battery). The charger is only to be used with the Nikon rechargeable Li-ion battery model EN-EL15. The time it takes to fully charge a discharged battery is approximately 155 minutes (2 hours 35 minutes) at 77 °F (25 °C). Charge times will vary depending on battery condition, initial charge state and temperature.
The battery itself is tiny - about 1 millimeter thick, 5 millimeters long and 6 millimeters wide. Montazami said the battery components, structure and electrochemical reactions are all very close to commercially developed battery technology.
Sulfur may join lithium inside batteries eventually. Scientists at Stanford University recently demonstrated a battery that used nanotechnology to , which increased the energy density of the battery by as much as five times, and also improved its life span. However, this development won’t hit the market for a few years.
Battery technology is always improving, with labs around the world looking for new battery technologies to replace lithium as well as new approaches to building lithium ion batteries. Among the new technologies, a lot of work has gone into supercapacitors, in which the battery stores energy electrically and then releases it, like a flash gun. Supercapacitors could allow for much quicker charging, as little chemical change is involved, but current supercapacitors can deliver power only in short bursts, which is the opposite of what most mobile devices need. Fuel cells that use hydrogen to generate electricity are also coming soon. The in January, uses a $10 cartridge to power a cell phone for up to two weeks. However, fuel cells are not yet small enough to fit inside a phone—the Nectar system charges the existing lithium ion battery and doesn't replace it.