Well that was a "top of my head" calculation. Maybe not too good on second thought. But my reasoning was if the Ahr rating of the battery is 80 and that is based on a 10 Hr discharge rate (8A) and if you are only discharging it at .1A then the capacity is effectively increased, by 50% maybe, so there you go, around 48 days. But I dont have the discharge graphs to back me up. Also that is based on a "fully" charged battery which I doubt a battery in a car is ever fully charged. Under ideal conditions it might make it but in pracitice probably not. The main issue here is that 100 mA is more than everyone thinks that car should draw. However I am suspicious of such a round number. Did they actually measure 60mA or 145? Big difference. As far as the solar charger, I have one on my Toyoya. Harbor Freight had them for 9.99 !!

Anyway, if it is really drawing .1A then .1A x 12V is 1.2W. So whatever is drawing the load should get somewhat warm. So you could leave the car overnight and then use touch or an IR thermometer to see what is warm.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra