NERMAK 6 Volt 12Ah Lithium Ion Heavy Duty Lantern Battery 2 Pack, 2000 Cycles Rechargeable LiFePO4 Battery for 4R25 Lantern(Spring S2 Terminals)

The rechargeable 6V lithium iron phosphate (LiFePO4) battery has garnered a mixed reception among customers, reflecting a blend of innovative features and critical safety concerns. Many users praise this battery for its environmentally-friendly characteristics, ease of charging via a USB-C port, and its overall performance when used in devices such as lanterns and deer feeders. Customers appreciate the substantial upgrade it provides compared to traditional dry cell batteries, highlighting its lighter weight and longer lifespan. Several reviewers noted that the initial charging time took around 30 hours, but once fully charged, the batteries performed reliably, even lasting through the entire hunting season for some. However, there are significant warnings issued by a few users about the safety of this product. Concerns arose regarding the charging process, where one customer experienced a troubling humming sound during charging, raising alarms about possible fire hazards. A complaint about the battery’s dimensions being slightly larger than expected, causing it to fit too tightly in devices, was also mentioned. More critically, a user described encountering a reversed polarity issue that affected compatibility with LED bulbs, leading to frustration and concerns over the product's safety and reliability. Notably, one account described a dramatic failure resulting in a burnt circuit board, igniting serious worries about the product being a fire risk. In summary, while the rechargeable 6V battery offers advancements in convenience and eco-friendliness, potential buyers should weigh these benefits against reported safety issues, particularly regarding its charging characteristics and fit. **