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I have a couple of Projecta Laptop power adaptors, they have a adjustable voltage selector to suit any laptop, you can get them from most Auto Parts stores for around $60. I use one on my Laptop and one to Power My Meade LX200 off my feild battery, they have 15, 16, 18. 19. 20, 22, 24, volt settings at 3.5 amps.
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