I need to find out what surface mount this is its black with a Y on it 
Electrical – SMT component identification
identification
Related Solutions
The board designators seem to be following IEEE STD 315 (kind of).
CR or D: Crystal rectifier (Diode) T: Transformer.
My guess is that this is a common mode choke on the power supply lines.
This looks like a resettable PPTC fuse with an additional control terminal. The third terminal is used for external activation: when abnormal conditions like overcharge or overheat are detected by the battery controller, it can force the fuse to open even if the current stays within limits:
(source)
The component sits on the glue blob rather than the PCB because it needs to stay hot when latched up. PCB would act as a heatsink and could reset the fuse before the short circuit is removed.
Best Answer
Going by look and reference designator (F20, mirrored in the OP’s image), it seems to be fuse. One of the fuse from Bourns can match it. Further confirmation can be made by inspecting the resistance of it. looking at the copper trace width, it looks like power plane. See the image below:
Datasheet: http://www.bourns.com/docs/Product-Datasheets/sf0603f.pdf