In the case of lithium rechargables there is supposed to be(not all have it, but SHOULD!!!) an internal voltage monitoring circuit which prevents the charging of the battery if the voltage is too low to, I believe, prevent attempting to charge an internally shorted battery. Lithium batteries can react explosively if not in proper operating condition. You can probably "safely" get away with a 9 volt battery because they inherently have such minimal ability to supply current, typically 80-100mah total capacity. I'd be VERY (as in behind a piece of nice thick lexan) careful attempting such with anything that could apply any current to speak of, especially at so many volts above normal operating voltage for a LiPO. Assuming you enjoy having your hands and still being able to see them as well.
If I were stupid enough to try this with a bench supply I'd limit the current and set the voltage no higher than 4.2 or so... at least until I disconnected power and measured the battery after a few 30 second periods of charging to see what was happening. I'd still keep my hands back and wear safety glasses or a face shield until I was sure I wasn't unintentionally making a Li'l Lithium Polymer Bomb (TM). Also would not try this on a metal desk or benchtop unless I was determined to short something and blow myself up a little. Note the large bomb in my avatar to the left.
