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January 23rd, 2026 15:07
Dell Precision 7740 12volt charging options
I have just taken delivery of my refurbished 7740 which is to replace my Latitude E7440 for use in the field filming wildlife. Dell supplied a 12volt cigarette socket charger for the Latitude but there is not one available for my new 7740.
I believe I can charge the 7740 using one of the Thunderbolt USB-C ports. Please advise and if you can recommend a 12volt USB-C charger.
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ejn63
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30.8K Posts
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January 23rd, 2026 15:23
This system needs a 240W power supply -- I don't think you're going to find an adapter capable of that. The older system needed only 90W at most.
steve_hi11
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January 23rd, 2026 23:45
@ejn63 Correct the mains charger is rated at 240W but that must be a maximum value for running the laptop whilst charging at the same time. I have heard that a 100w 12v USB-C charger will charge the laptop overnight when in hibernate mode or powered down. Looking for clarification and recommendations for such a charger. thanks for your reply.
anne_droid
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1.5K Posts
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January 25th, 2026 13:25
Hi
Perhaps....
https://uk.ugreen.com/collections/car-charger/products/nexode-145w-car-charger-retractable-cable
https://www.otterbox.co.uk/en-gb/fast-charge-dual-port-car-charger-100w-black/77-98237.html
or maybe I am missing the point.