Finally got it solved !!!
I have nokia Lumia 710, my mobile battery drained out while using GPS.
And mobile was not turning on at all, tried with typical wall charger, laptop USB port, but no luck.
I googled but not found solution but an workaround to buy new battery.
mean while I purchased an Battery Pack, ( Yell BPS19 ), to avoid such problem.
I thought to try connecting it with Lumia phone. and a wonder ......
After a 2 mins, mobile vibrated, and next 2 mins empty battery sign apperaed on mobile.
in next few minutes mobile got self power on.
.
It is worth trying with other batter packs also.
I am happy about it and like to keep all Lumia 710 mobile users. hope it helps.
Regards,
Jitendra Hatkar