PORTABLE ELECTRONIC SYSTEM INCLUDING CHARGING DEVICE AND METHOD OF CHARGING A SECONDARY BATTERY

摘要

In one aspect there is provided a portable electrical system comprising primary and secondary devices the primary device having a first lithium cobalt oxide battery and the secondary device having a second lithium iron phosphate or lithium titanate battery wherein the primary and secondary devices are configured to allow recharging of the second battery from the first battery at a rate of between 2C and 16C.