Well, this thing seems impossible if it involves heavy usage of the smartphone.
These external batteries do not require a wall socket to recharge your phones.
If both your Lumia and portable charger need charging, make use of the daisy-chain feature.
The Lumia 1520, for instance, which is still considered a flagship has a battery of 3400 mAh.
All three portable chargers comes with two USB ports and will be available in black color.
These products will be sold via Microsofts online store later this month.
source: www.techworm.net
