Epson P-2000
Lithium-Ion batteries
Lithium-ion batteries are renowned for being lighter yet having higher power density than Nickel-based batteries. With Lithium-Ion batteries used in the P-2000, you get longer battery life in a lighter package. There's also the very real benefit of being able to recharge Lithium-Ion batteries when it suits you, rather than having to go through the full charge and discharge cycle typical of Nickel-based batteries.