Mobility is increasingly viewed as an essential attribute of today’s lifestyles, both personal and professional. Advanced electronic devices such as cellular phones and portable computers now permit people on the go to operate more effectively than was possible in home and office-bound environments of a generation ago. But the price of mobility have been increasing demands and dependence on portable power sources. Fortunately, with the development of new nickel-metal hydride(Ni-MH)battery options, improvements in electronics have now been matched by significant improvements in the batteries that power them. Nickel-metal hydride battery cells provide more power (in equivalently sized packages)than nickel-cadmium(Ni- Cd)cells while also eliminating some of  the concerns over use of heavy metals in the cells.