Battery on my Vector Model 157 will not charge. I have left it plugged in overnight with no results

SOURCE: Can a lithium ion battery be overcharged?

Here's a small FAQ I found: 1) My lithium ion battery is the SONY NP-FP70 Battery Pack. Does the fact that the battery is called a battery pack mean that it has built in circuitry to prevent an overcharge? No. I write with some authority since I've dissected too many and there is no such circuit in the battery. From a system perspective it doesn't belong there. 2) Is there any way of knowing if my SONY BC-TRP charger has the circuitry for preventing an overcharge? You'll have to ask, but the key clues are: a. The documention tells you to not leave it plugged in overnight. b. The battery gets too hot and melts the plastic. 3) If I charge my battery in my camcorder (SONY DCR-HC40), can I assume it has the built in circuitry to prevent an overcharge? a. One can't assume anything. b. But from what I read on that model, you plug it in and forget about it. To do that, it would have a proper charge circuit.

SOURCE: Batter won't hold it's charge if left in the camera overnight

Apparently you shouldn't leave the battery in the camera when you're not using it - the on/off switch doesn't turn the thing off completely. Weird!

SOURCE: LOST AC CORD TO RECHARGE THE VECTOR VEC-157

u can get the cord from  radioshack just order 1 online for you.

SOURCE: Acer 5315 Battery cHarging Problems

All rechargeable batteries have a limited life, and as they age their charge capacity reduces over time and you get shorter and shorter time between charges.
Recharage batteries have a finite number of charge and discharge cycles and batteries over 2 years old are considered nearly worn out. Worn out batteries won't charge up at all.

SOURCE: battery drains quickly. Loses charge when plugged

Sounds like you need a battery. The key here is that the battery is losing charge while it is supposed to be charging. Works like a car battery, even if the alternator is working 100%, if the battery is pooched, the car won't start.