The LTC4071 integrates a complete low battery disconnect feature which consumes nearly zero current from the battery when disconnected, less than 1nA at room temperature and less than 25nA at 125°C. To provide this function in the LTC4071, the LTC4070’s LBO and DRV pin have been eliminated. This makes the LTC4071’s maximum shunt current fixed at 50mA and increases the IC’s quiescent current to 550nA. By comparison, LTC4070 is 50mA capable with 500mA possible with an external FET and features only 450nA quiescent current. The LTC4065L charges 1-cell Li-Ion at 4.2V only, has higher charge current, but no NTC or load disconnect capability and is not battery stack compatible. Also, it cannot charge from low current intermittent or continuous input sources due to its 120µA operating current.