I've been seeing battery booster packs advertized in various places. TV informercials and elsewhere. They're to be plugged into a vehicle's cigarette lighter and used a like a booster battery. They have booster cables and apparently some also have AC and DC plug-ins and inverters to run such things as portable electric coolers and other devices you might have in a Westfalia. My interest is in the refrigerator (my home made West has no fridge, and no secondary deep cycle battery). 

I'm wondering if anybody has really used/lived with one of these devices and can tell me what it can do. They seem to cost $120 + US. I'd be interested in one if it could keep a cooler cool without recharging from evening till morning (say 12 hours). 

Any real life experience would be appreciated + anyone who knows which are the good brands.

Alan Pickersgill

85 Transporter/Westfalia
Ottawa Ontario 
Canada

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