Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Welcome, Wendie. Please take a minute to click the user cp link and complete you BW profile re: vehicle and location as that is often helpful information.
Cold is not a friend to batteries and with only an occasional start, my guess is it is either seriously discharged or sulfated. Typically it takes about five to ten minutes of driving (not idling) just to replenish what it took to start the car, never mind that it was already low. So you might have just been slowly draining it.
Batteries that sit for extended periods at less than a full charge will also sulfate, which shorts out the cells.
In either case 20 minutes over jumper cables will not have much of an effect.
If you are confident the battery is still good and just low, remove it and take it to a shop that can recharge it properly and then cycle-test it; depending on where you are this will cost as much as $40 or maybe more.
Or you can call MB Roadside assist and they will come install a new battery for its cost with no labor charge.
FWIW storing a car is one of the worst things you can do to it. Best to take it out for a 20-30 mile gentle drive every few weeks or as often as that is possible.
Take care and enjoy the ride,
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)