NEED TO BUY ONE BATTERY SEALED LEAD ACID 3 AMP HOUR VEC191

Question edited into English. We only speak English here, we are a north American website.

Vector VEC191 Spotlight Replacement Battery 2 Batteries ...

https://www.batteryspec.com > cgi-bin > cart
Vector VEC191 Spotlight Replacement Battery 2 Batteries Required TR6-6 Tempest AGM, Valve Regulated, Maintenance Free, Sealed Lead Acid Rechargeable Battery ...
https://www.google.com/search?q=VEC191

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http://www.atbatt.com carries a large array of sealed lead acid batteries. I did a search for 12V 2.8ah and here is one of the results:

http://www.atbatt.com/sealed-lead-acid-batteries/b/interstate/m/interstate-12v-2-8ah.asp

If you can find a sealed lead-acid battery of the same size, with the same Amp-hour rating, then yes, you should be able to replace it. You won't know the size or capacity rating until you open it and see what is inside.
Make sure that the unit is unplugged before you open it, and even then (since it is designed to produce 110v even when the power is out) be careful about touching any metal. If you are not familiar with electricity, you might want to just buy another one. http://www.infinitecables.com/ups_man.html seems to be one place to find these types of replacements. I have seen them at Frye's Electronics, if you have any of those locally. google sealed lead acid battery for more sources.

Battery 6 Volt Stairmaster SM14123 SPORTSMITH net

There are many companies on the Internet that offer Sealed Lead Acid Batteries, which may be less expensive than replacing the light. I would suggest identifying the particular battery your light has and then check what's available on the Internet to make a decision on whether it is cheaper to replace the battery or the light.

http://www.batterywholesale.com/battery-store/SLA-batteries
http://www.batterymart.com/c-sealed-lead-acid-batteries.html
http://www.atbatt.com/sealed-lead-acid-batteries.asp
http://www.zbattery.com/Batteries/Sealed-Lead-Acid
http://www.planetbattery.com/product.asp?id=10

The battery is a 6 volt 4.5 Amp Hour Sealed Lead-Acid Battery. The part number is CA645. It may be found at Radio Shack, Home Depot, or Lowes.

NP is a part of a model number for Yuasa. NP4-12 is a 12volt 4amp hour battery that you can find at BatteriesPlus store near you. www.batteriesplus.com

In March, 2006, Black & Decker purchased Vector Products, Inc. Since the acquisition, Black & Decker has assumed the manufacturing of all Vector products. For customer service and warranty information for Vector products, please contact Black & Decker Customer Service. Or, you can order a replacement battery from: www.batterymart.com/p-6v-4_5ah-sealed-lead-acid-battery.html

You need a new battery, their life is around 5 years, or if you leave them discharged for a while they start to loose capabilty to hold charge.

It depends on what voltage the internal battery is. If it's a 6 volt, the charging voltage will be a little higher, close to 6.5 to 7 volts. Most of these spotlights are 6 volt. New batteries can be found at Battery International: http://batteryinternational.com/spotlight-batteries-vector-battery.html