There reasons to why your battery isnt charging, it could be either the battery is old and has become bad or it has low liquid levels in it.
SOURCE: Schumacher 2/10/50 amp charger,125/225 amp starter
It could be an internal fuse, or that the transformer is malfunctioning.
Before any dis-assembly/internal inspection, be sure that the unit in unplugged.
Good luck...
SOURCE: Honda PC 800 Starter motor sluggish, barely turns
Try new battery, check grounding contacts for corrosion, clean the contacts on batt cables at both ends.
SOURCE: how long do i have to charge the stanley j309 300 amp battery booster
Before the first use, the unit must be charged for 24 hours with a connection to an AC outlet (120V). Make sure that all of the switches are off. After that, stop charging when two red and one green LED Battery Status Indicators light.
If you are recharging the unit from a 12V battery, do not charge for more than 6 hours. (Check for a full charge by disconnecting the DC charging adapter and then press the Battery Power Level button.)
The manual for the Stanley J309 battery jump starter is available on the product page here: http://www.baccusglobal.com/stanley/j309.php . The direct link to the manual is http://www.baccusglobal.com/stanley/manuals/JUMPERS/J309%20MANUAL.pdf .
I hope this helps.
Cindy Wells
SOURCE: How can I tell when my stanley 450 amp instant starting power station is fully charged?
I would suspect that the internal battery has reached the end of its life. Surely there is a green light to indicate when it is charged?
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