Although the following info is not for the same battery rating 680 mAh versus 900 mAh. I can safely presume that it applies in my circumstances as well.
3.0V Li-ion RCR123A rechargeable battery
3.0v Li-ion battery charger
It is this info that finally appeased my mind.
BTW this info cannot be found on Tenergy's site, well at least not in PDF format.