The blinking icon indicates there is not a good connection between the Charge Base and the battery. First, try to re-seat the controllers on the base. If that does not resolve the issue, try applying rubbing alcohol with a cotton swab to the contacts of the battery; do not apply rubbing alcohol to the contacts on the Charge Base. If this does not resolve the issue, please contact customer support for further assistance. Our customer support can be contacted here.
Make sure when using the battery packs to apply the special cover (included) for changing the battery. If you no longer have the cover, please contact customer support for further assistance. Our customer support can be contacted here.
Red indicates a 0-25% charge level, Orange is 50% and Green is 75%. Once the battery has a full charge, the indicator will turn off.