When I charge my batteries, the display shows red- low battery. I have to plug the charger in multiple times in order for it to read green- full charge. This does not happen with any sort of consistency, complete random. Sometimes it reads full after a single charge attempt, sometimes it reads red, and number of re-charge until green is random. When the recharge happens the process it quick because the charger recognizes that the battery is charged. I can not figure out why it does this - I need some input!!!