Charging Habits (frequency,120v vs. 240v, etc.) and Impact on Battery Degradation

Since I rent a condo and don't have my own garage with the ability to easily charge my Model S every night, I'm curious what impact different charging habits may have on the Model S's battery life. Here's a list of possibilities.

A.) I only charge it every few days (1x - 2x a week) since my commute is short, and do so by charging at public charge stations, friends' houses, work (if they were to have a charge station), etc. If I have the 300 mile range Model S and my commute is just 20 miles round trip, I could easily get by with infrequent charging, but at what cost to the battery life?
B.) I get access to an electrical outlet in my complex but it's only 120V. I charge it every night via 120V, and am OK with not always being at full capacity because my commute is short. If I am planning a longer trip, I would need to plan accordingly and let it charge longer

So long story short, what impact on battery life would it have if I were to charge the battery infrequently (only 1x - 2x a week as an example), charge it primarily with just a 120V standard outlet, or a combination of the two? Keep in mind that I may also rarely have it fully charged since I wouldn't have the luxury to charge it overnight, every night at 240V.

SCW-Greg said:

Okay this may answer parts of your question, and probably more than you want to know in other aspects, but it makes for a great knowledge base on battery care and maximizing longevity. From the source...

Tesla Roadster Battery Care

Click to expand...

Thanks. So based on that thread, it would seem to be beneficial to not always keep it at full charge, which is a problem I certainly won't have. Lets say my commute requires 10% of the battery, I could drive it for more than a week and bring it down to say 20 - 30% SOC before charging it back up. Not only does this fit my living situation well, it actually has the benefit of preserving the battery life a little better.

I'm still curious about the impact of using 120V as the primary source of charge.

Thanks for the replies. Those two scenarios are more hypotheticals than anything else. It's not as if I have a choice of one or the other. It could be the case that I don't have even access to any kind of electrical outlet where I live (that's in flux since I do seem to move a lot; but do prefer to live in a condo in a city), and would need to find a way to charge via public charging stations, a friend's house, etc.

dsm363, while it's certainly easier (and therefore recommended out of convenience) to re-charge every night, it would seem that it's actually beneficial to allow the charge to drop a bit before re-charging (say to 50% SOC at least). But when you do re-charge, you'd want to re-charge completely so as to re-balance the batteries.