Try replacing the battery.
the glo battery specs 1200mah 3.7v 4.44wh.
in ebay
http://www.ebay.com/itm/181345368586...%3AMEBIDX%3AIT
Size: 5.0mm(H)* 45mm(W)* 62mm(H) 3.7V 1500mAh
EDIT:To install the new battery you need to cut the wire of the old battery (recommended in half the length), and solder and isolate the wire to the new battery, so you can use the connector.
a guide to open the back with pics:
https://www.mobileread.com/forums/sho...d.php?t=209122