This is a new high quality Lithium ion polymer battery for the Palm V and Vx.  The battery has a one year warranty.  The Palm V and Vx are fairly difficult to open because the back is glued on, you must heat the back to soften the glue.  There are also other causes of a short battery life for this model, it could be the backlight chip or a bad Flash memory chip.

Rating 3.7 VDC, 500 mAh