The Northstar Top terminal NSB170FT Telecom/UPS Blue+ battery is a Partial State of Charge (POC) battery. Most AGM batteries need a 100%+ recharge, these batteries do not need a full recharge. Allowing them to need shorter recharge time. These batteries are a perfect solution for off-grid power. The NorthStar Blue Star battery is a premium AGM battery designed for emergency backup in float applications where there are semi-stable mains. These batteries have a long shelf life of 2 years and a design life of 10-15 years. These batteries are best suited for applications where the power-grid is unstable and heavy cycling and high power are required.