Hi All, Apologies if this is on another thread, but I haven't been able to get detailed info on what each battery type designation (A, B, C, D, E, F) means. I know the charging speed is improved on each iteration, but not much more. I also know you can find your battery type on a sticker hidden underneath the car behind the front passenger wheel well. Does a specific battery version (i.e. F) mean that it can be upgraded? Is it a new type of shape/size/weight? Or is it just more efficient in charging/maintaining charge? Thanks in advance for any info you have!