I do not find a place to order a new Archos 50 Diamond battery. The battery is connected with a 6-pin orange ribbon to the phone. The marking on the battery is:
Beijing Benywave technology Co.,Ltd
Polymer Li-ion 3.8V 2700mAh (10.26Wh)
Model: TBT5701
1|CP4/60/76
Limited Charge Voltage: 4.35V
Date: 20150413