I like the high standards of your productrange, reasonable prizes, warranty, clear website information (product specifications including compatibilities), wide range of payment options and speed of delivery. What could you do beter? Well, contrary as mentioned on the website I did not recieve a UPS return consignment note for the pickup of my old battery.
For the Environment take the old battery kits back and recycle them.
Make the shipment go quicker. Between order and first sine of chipment were 3 days.
Make the payment system better if one choose PayPall although in the past it was on invoice. Accept that choice. It save's at least a day between order and shipment.