Today, most digital camera (not DSLR) use single cell Li-ion. The cutoff voltage is 4.2V. This can be measured just after the camera is fully charged.
The current output of this kind of charger is usually 300-800mA, this can be found from the label of the charger.
For general Li-ion charging rule, the charging current should be below 1C. For 17670, the capacity is >1500mAh (Mine is 1800mAh). So it will be safe to charge 17670 with lower than 1500mA. 99% of camera charger has current <1500mAh.
For other Li-ion, as long as the C rating is higher than the charger, it can be used.
Exceptions are :
Some special Li-ion with 3.0V rating and maximum 3.6V charging voltage.
Some old Li-ion with 4.1 terminating voltage.
Mobile phone charger which plug into the phone directly. The charging circuit is inside the phone, not the adaptor.
Hope this can help.