Problem with my spotlight

Question edited for clarity.

They are here Jim

Vector Spotlight VEC1395 Spotlight 3 Million Power Series ...

https://www.batteryspec.com > cgi-bin > cart
Vector Spotlight VEC1395 Spotlight 3 Million Power Series Battery Dimensions: Length 2.76", Width 1.85", Height 3.98" (Total Height 4.21"), F1 terminals ...

My guess is the batteries are probably no good. All batteries will only last so long and it also depends how often they are keep charged and discharged. Basically all batteries require some kind of maintenance (recharging / discharging).

The short answer is "The tip should be set to positive (+).

I found an old Vector VEC127Y Spotlight. It appeared to be in perfect condition but the battery was dead and there was no charger. I was able to buy a replacement battery at BatteriesPlus for $21 USD. Here is the link for the battery
REPLACEMENT VECTOR VEC127Y BATTERY
I also purchased a Universal A/C adapter to use as a charger at BatteriesPlus for $17 USD. Their site does not list it yet but here is the manufacturers link. Please note the original battery was rated 6Ah. The replacement is only rated for 5Ah. Which means one less Amp hour (Ah). Which means a shorter run time, after charging, than the original battery had. Otherwise they are equal.
UNIVERSAL AC ADAPTER
I installed the new battery. I set the AC Adapter to 6V and installed the largest of the seven adapter tips that came with the charger, with TIP set to be positive (+). I opened the battery compartment of the spotlight and disconnected both the red (positive +) and black (negative -) battery leads from the battery. I then plugged the adapter tip of the Universal AC Adapter into the spotlight and plugged the AC Adapter plug to a power outlet. With a multimeter I tested the polarity of the spotlight battery leads while charging. I was able to confirm that the Adapter TIP should be set to positive (+). After reconnecting the spotlight battery leads and setting the AC Adapter to charge, I have a perfectly great spotlight in full working order.

The fuse has a lower AMP that is why it is blown every time you switch on the spotlights. In order for the fuse not to be blown, my suggestion is try the direct connection on the spotlights. Connect the spotlight directly to the battery. Just put a switch on it. If you want to use the spotlights, just press the switch.

You can purchase a battery from Black and Decker, they purchased Vectorlite in 2006, here is the link, you will need to enter the model #
http://www.dewaltservicenet.com/servicenet_home.aspx?AspxAutoDetectCookieSupport=1

your battery is gone. chk with coleman for replacement

http://cgi.ebay.com/VECTOR-1-MILLION-CANDLE-POWER-SPOTLIGHT-FLUORESCENT-NEW_W0QQitemZ220469526499QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item335501ffe3&_trksid=p3286.c0.m14

While it could be the battery, it could also be the internal charger in the spotlight. When you plug it in, it bypasses the charger and uses the connected power. However, it is likely just a bad battery. The batteries only last 3 years in an ideal setting and since these lights are typically only used certain times of the year, the batteries discharge and go bad. New batteries can be found at: http://batteryinternational.com/spotlight-batteries-vector-battery.html

The replacement battery for this vector spotlight can be found here: http://batteryinternational.com/vector-sport-spot-138by-spotlight-batteries-vector-f1.html

Hope that helps.