Hello Bobby,

It is unfortunate to hear that the run time is unsatisfactory. The run time of a lawnmower is dependent on the load acting against the unit and fluctuates depending on the height setting, the terrain, grass height, type of grass, whether you are mulching, using self-propelled function etc - there are so many factors to consider. The run-time of a battery would depend on the load acting on the unit while in use (speed, terrain, unit height, grass height, and density). Please be aware that the more power being used from the lawn mower (i.e. lawn mower speed, terrain, grass height, density, etc.), the faster the battery charge will drain.
Here are a few tips to help you extend the run time.
1) Set the mower to the highest cutting height (or 1/3 of the length of grass), mow no more than 1/3 of the total length at a time.
2) Mow in the morning or late afternoon to reduce the heat stress on newly cut grass and ensure that grass is dry.
Lastly, when the battery is placed in the charger the charger detects the temperature of the battery and will begin charging once it cools down slightly to charge. This is normal operation based on the protection system in the charger. All is operating as intended. We hope these tips will help you with the issue you have encountered, however, if they do not please kindly contact us at 1-855-345-3934 or by email on info@greenworkstools.com. We would be happy to look into this for you.