A lithium battery pack should be selected by usable energy, not only the printed amp-hour number. For solar battery Sri Lanka applications, confirm the inverter voltage, daily consumption, maximum discharge current, and charging profile.
Check the BMS
The battery management system protects the pack from overcharge, deep discharge, overcurrent, temperature issues, and imbalance. A weak BMS can shorten pack life.
Plan for support
Choose a supplier who can test, repair, and diagnose the pack later. Avrio Technologies supports lithium battery packs from selection through maintenance.