Hello xyriut,

We are sorry to hear about the experience you have encountered with this battery. The overall battery life is dependent on many factors such as where they have been stored, charged, and handled. When the battery will not be in use, we suggest storing it indoors, in a cool dry area - away from direct sunlight. Leave the charger unplugged and the battery disconnected from the charger unless it needs charging. It is recommended to store the battery with a full charge, and if it is being stored for a period where no use is expected, to check on the charge every couple of months. If you notice the charge has dropped, we advise charging the battery back up to full before returning it to its safe storage place. Following these steps will ensure you receive the most of the battery life. Please know that our batteries are covered by the manufacturer's warranty as stated in the owner’s manual period from the date of purchase. Nonetheless we are interested in hearing more about these issues especially, since it seems that you have two units experiencing the same problem. If you are interested in discussing these issues directly with our team, please give us a call at 1-888-909-6757 or send an email using the customer contact form located on our website. All we ask that you have access to the battery and charger so that we can complete troubleshooting with you and gather necessary unit information.