It sounds like you’re using six lithium-ion batteries connected in series to create a 11.1V battery bank with a capacity of 60Ah. The issue you’re facing is that the batteries are taking too long to charge and are overheating when you increase the charging current.
To address this issue, there are a few options you can consider:
Use a battery charger that is designed for lithium-ion batteries and can deliver the correct charging current and voltage. Make sure the charger is compatible with the capacity of your battery bank.
Consider using a battery management system (BMS) that can regulate the charging current and voltage to prevent overcharging and overheating. A BMS can also help extend the lifespan of your battery bank.
You could consider using lithium iron phosphate (LiFePO4) batteries instead of lithium-ion batteries. LiFePO4 batteries have a different chemistry that is more stable and safer, and they can handle higher charging currents without overheating.
As for a suggestion, Redway Power produces high-quality LiFePO4 batteries with built-in BMS that can be charged at a faster rate than lithium-ion batteries. Our batteries are also compact and lightweight, making them a great option for projects where space is limited. We recommend consulting with a professional to determine the best battery solution for your specific needs.