vikki99, I have moved your post to the UXcell forum so they may be able to offer you some assistance.
The way I see it you have 2 options you can either return your player to Uxcell for them to sort it out or you can void your warrenty and try replacing the battery.
I am not familiar with the Rhodium player but they all seen to use a Lithium polymer battery. Battery replacement depends on what size space you have for the battery. I posted details of 1 player that I replaced the battery with a iPod 3rd generation LithiumPolymer battery here:
http://www.mympxplayer.org/18-hours-...ge-vt2412.html
The battery used was quite large and had an 850mAh rating which returned me 18 hours continuous music play time. The player has worked perfectly without any problems since the upgrade.
I have also replaced the batteries in 2 other player using an iPod Lithium Ion replacement batteries for an ipod mini, smaller and rated 600mAh they have both worked without any problems and return 13 hours continuous music play time.
The only difference with the batteries is that the iPod batteries have 3 wires black, white and red. The white wire is not used in these players so i just cut it of and taped it to prevent a short and soldered the black and the red as they were with the original batteries.
Should you decide to replace your battery I give this information only as a report on my findings and accept no responsibility should you try this for yourself. Also as mentioned you will void your Uxcell warrenty if you as much as open your player.