Not really, that’s still the sweetspot for most lithium batteries as well (being under 20% is much more critical than being over 80% though). What’s different

Not really, that’s still the sweetspot for most lithium batteries as well (being under 20% is much more critical than being over 80% though). What’s different between them is battery memory effect. With NiCd & NiMH you are supposed to let it discharge until 20%, then continuously charge up, and then repeat. With Lithium based batteries it’s a recommended practice to charge in short bursts and keep the battery at a medium level. In any case, most devices now a days will manage the battery in ways that you should not really bother. It’s amazing the conplexity that battery systems have nowadays.