What is the fine-grained topic of the following text: While this is the only charger one should use for the 76.8V (24-cell) BatterySpace LiFePO4 battery pack (other 76.8V LiFePO4 "smart" chargers sold by 3rd party vendors will actually damage this fine-tuned battery pack), the 12VDC cooling fan circuit dies after only about 200 charge cycles. Only return the topic.
Charging and lifespan issues of the 76.8V BatterySpace LiFePO4 battery pack