LTZ 14-4 Sealed Lead Acid Battery - Kipor LTZ 14-4 Sealed Lead Acid Battery Leoch Camper Trailer RV

Vector Battery - Vector VEC199 Replacement Battery (batteryinternational.com)

You might check the compatibility of the following:

12 Volt 1.3 amp hour (12v 1.3ah) Rechargable Sealed Lead Acid SLA Battery - Walmart.com

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

https://translate.google.ca/?sl=auto&tl=en&text=Necessito%20adquirir%20uma%20bateria%20para%20lanterna%20vectorlite%20%2CMaintenance%20free%2C%20sealed%20lead%20acid%206%20volt%2C3%20AmpHour%20VEC191&op=translate

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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

This battery should work -
12 Volt 7 Amp Sealed Lead Acid Battery

It is a 12 volt , 7 ah battery rated at 20 hr. Here is what the 20 hr actually mean -
What does 20 HR mean?

Open it up and find out what kind of batteries are in it.
12V 18Ah Sealed Lead Acid AGM (Absorbed Glass Mat)
AKA Gel Cell
Dimensions not listed.
Don't be surprised if the replacements cost more than the device.
The user manual says that the unit is not designed to have the battery replaced.
http://allpowersupply.com/Productlib/manual-PKC0BK.pdf

12V 18Ah Sealed Lead Acid AGM Google Search

This battery from Amazon.fr is a direct replacement for the one you are looking for;
http://www.amazon.fr/Wentronic-46758-Chargeur-Blanc/dp/B002E4WJJU/ref=sr_1_2/275-7749352-1575368?ie=UTF8&qid=1376668740&sr=8-2&keywords=6v+sealed+lead+acid+battery

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

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

The sealed lead acid batteries in them have come down a lot in price now, see here for one on batterytrader, 12v 7ah sealed lead acid battery