Lithium batteries' huge energy capacity means they last longer for each charge and are capable of easily 10 times more cycles (number of times they can be charged and discharged) than lead-acid batteries. Our lives are now so jammed full of technology of all kinds,. The Ah number shows how much energy can be delivered by the battery over a period of time. So a 100Ah battery coulddeliver 100 Amps for. Battery lifespan can be measure in cycles – that is discharge/charge cycles a battery is capable before it's ability to deliver power diminishes and it drops below 80% of the battery's rated. Depth of Discharge refers to the % you can discharge your battery. When you reach that % you must you must recharge. For lead-acid batteries,. Lithium batteries extremely long lifespan and capability for a huge number of cycles means that it works out much cheaper than lead-acid batteries. Lithium batteries have so many more cycles than lead-acid batteries because their energy density is far better than lead acid.