Do not use to lithium battery.
The range of capacity is 20-200Ah.
SMART CHARGER is able to use only 12V.
It is able to charge. After full charged, the charging step goes to maintain charge.
If the charger is connected to standard battery, please take care of the level of battery electrolyte. If you are away for a long day, please disconnect the charger from AC power.
The battery has deteriorated.
It is possible that the bubble which happened during charging is caught to indicator. If so, please shake the battery, and then the battery indicator will be changed to green color.