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Hack Needed: Rechargeable Halogen Spotlight

Greetings all, I'm in need of a hack to replace the lead acid battery in a rechargeable halogen spotlight purchased at a local store. The spotlight came with a AC recharger but 15 charge time hours returns only approximately twenty minutes of usable light. I'd much like to replace the power source with something of a longer duration than the current one third of an hour. As much interested in simply rewiring the device to work from my car's AC outlet if possible. Mind I only have a few dollars invested in this device still I'd like to see if a replacement power source is worth the effort. Thanks to all who reply.

http://ledmuseum.candlepower.us/third/fixit.htm

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Padlock7 years ago
If the internal battery's voltage is 12 volts, then it can run directly off the car battery- just take the wires from a cigarette adapter and attach them to the appropriate wires. If it isn't, you would most likely have to buy a pretty heavy duty transformer to bring it down to whatever voltage is necessary from your inverter.
patron_zero (author)  Padlock7 years ago
My thanks for the replies, I have a scan of the battery that has it's specifications. Attaching that image here, let's hope your suggested solution is a possiblity.
spotlight battery.jpg
Ok, so you have a 6 volt battery @ 4 amp-hours. Your light uses the entire battery in 20 minutes, or 12 amps an hour. So you would want a 6 volt 12 amp transformer... that's pretty big. Your inverter would want to be rated at least 75 watts continuous, as well.
12V Padlock7 years ago
most 1million candle power torches use a 6v55w halogen h3 lamp
12v h3 55w lamps are in some car headlights!
also why not use a 12v h3 and connect the wires that connect to the battery the the cigarette lighter socket? you can even get 100w ones =2million candle power(if you don't melt the lens!)
Padlock 12V7 years ago
Because he wants to convert this one... not make a new one.
12V7 years ago
please can you take some detailed pictures of the insides and the battery(picture all wires..etc..)with the info on the battery so i can see it then i can hopefully give you instructions on how to get it to work off 12v(car,lead-acid battery..etc.)for as little as free!(depends on the insides and what you have lying around)