Answer : Lithium chemistry gives you both!
As a starting battery, LiFePO4 chemistry gives more than 2x the CCA for the physical size and most lead acid/AGM. This means they are an excellent ‘start’ battery for a large or high compression engine. It also means, if space is tight, you can install a smaller battery for the same start power. In the case where dual batteries were used in parallel as starters (LandCruiser 79/200, Prado, early Navara, etc) a single MEGALiFe can be used for the start enabling the other space to be left for other accessories or an Aux battery.
Although the Ah numbers do not appear to be the 'same' as a lead-acid (AGM/Gel/sealed), lithium chemistry allows for 100% depth of discharge, not the regular 50-70% you see in ‘deep cycle’ lead/AGM batteries. For example, a 100Ah lead battery may have a usable capacity of 50Ah based on the manufacturer 50% DOD recommendations where as a 50Ah lithium battery has the same usable energy/Ah due to discharge capability!
Check out all the specs for our range here. Also check out the blog for more in-depth information on some of the technical differences of MEGALiFe lithium including the ‘myth of the Ah’, battery life, cold cranking amps and more!