Do you have an advanced smartcharger with a display or a "smartcharger" that just detects voltage and charges to the top?
If the former (eg. iMax B6AC, Turnigy, etc.) there is a lipo storage charge mode set it on that. If the latter just charge it up to the top and leave it as is. I always have my batteries charged top the top (and I own an advanced smartcharger with display).
AFAIK from the factory batteries will come half charged.
BTW: If you ever need to jump start your car because of a flat battery and you have an advanced smart charger you can attach the clips to your cars battery terminals and charge on lead acid mode at 12V (probably safely at 5 Amps as well).
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