A 100Ah battery will last for around 5 hours if running a load of 10A at -10 °C. This battery will last for 10 hours at a 10A load in the normal temperature range. A 100Ah lead acid battery can only give you a maximum of 50Ah of its available capacity before it drops below 12 volts under load. One of our 100Ah lithium batteries can give you 100Ah without a damaging voltage drop.