I hated the constant playing up of the Irex DR1000 recently.
Pretty much the behavior was the same as the experience of MrWarper, and the fact that I have to watch constantly for not over discharging the device battery. Thus, I have decided to change the battery to something closer or identical to the original one which was according to Varta is 1300 mAh.
The new replacement battery is yet another Cameronsino product :
Volts: 3.7 V
Capacity: 1300 mAh
Dimension: 60 x 37 x 6 mm
The Battery is in fact more like 5 mm thick, or the same thickness as the previous two batteries used, and it fits perfectly without any alterations of the casing.
I don't like, and I am pretty fed up with the constant playing up of the device with the 1500 mAh of the previous CS battery, although it was nice from time to time to have 12&1/2 hours of use without charging.
However, the device is constantly being over discharged and its behavior is as if the battery is constantly full, where in fact was less than a half discharged.
I will try to keep you updated on the behavior of the Irex DR1000 with the new CS-TM920SL.
BTW, CS are no longer making the 1500 mAh model and are stating that the CS-IQN600SL model is now 1150 mAh instead of the extended 1500 mAh, which I had in the Irex DR1000.