The life of a lithium battery is based on charge cycles, typically 700 to 1,000 or there abouts depending on the type. It is my understanding that everytime you chage you are using up one of these cycles. So to maximize the life of your battery, you should let it go down as much as you can. A 10ah battery should give you 30 to 35 miles of range before need to charge. Charging a 10ah battery every 14 miles would technically half your battery life in terms of years of usefulness. You should be able to comfortably get two trips to and from work on a charge.
The best way to make it last is to charge it every trip and not allow it to discharge too low too often. My understanding is that two charges from half charged to full is also a cycle.
This is just plain wrong. Lithium batteries of any chemistry will last longer the less they are taken to their voltage extremes (high/low voltage). This is why some individuals (myself included) do not charge to 100% and also ensure a rigorous low voltage cutoff during discharge. Actual voltages vary from chemistry to chemistry.
Two members have different views on charging cycles but I am not saying they are wrong. I work selling a number of different brands and this is the training I have recieved. I have never had a battery manufacturer tell me what is the correct proceedure for maximizing battery life however.
