I hae travelled in 3AC of GR, Ernakulam Mumbai, and I saw that Charger ponts are provided in each section of 8/9 berths
I also saw in Netravati express Mumbai to Ernakulam similar facility
So you can safely presume that Chargers are there.
Since Chargers are the life line of communications channel of mobiles. Govt haas woken up to this need....
more... But they are slow to implemetn same in SL and second class.