4 ms·
Question.. All my device lithium batteries seem to lose ~70% of their ability to hold charge after 500-1000 cycles, however the tesla car batteries/powerwall cl
by noddy1 9y ago
Question.. All my device lithium batteries seem to lose ~70% of their ability to hold charge after 500-1000 cycles, however the tesla car batteries/powerwall claim to give a decade+ of use despite being built of the same cells. How does that work?
- zie 9y agoThere is more battery in the box than what they advertise/offer up for you to use.. I.e. there are spares built in. Also they have spent a lot of time/energy/hardware making the environment the batteries live in, as close to ideal as possible (i.e. thermal cooling, etc).
- Aron 9y agoI believe most of the physical damage done to a battery occurs either near 0 or 100% charge, and assume that automotive batteries are less frequently fully depleted.
- jononor 9y agoThey probably also never charge them up fully (have extra capacity wrt promised), at least when new.
- Baeocystin 9y agoIf you never discharged below ~30% or charged above ~80% of their true capacity, and made sure they always stayed within a comparatively narrow thermal envelope, your batteries would achieve the same lifespan. The last quarter-charge in either direction is where ~80% of the lifecycle wear comes in, and temperature excursions account for much of the rest.
- agumonkey 9y agoFrom what I gathered, lack of internal voltage allow for different chemical reactions and structural changes that either create resistance, or actual shorts.
- ZenoArrow 9y agoAre they built of the same cells though? There's not just one single type of lithium battery, there are multiple different lithium battery chemistries, with different strengths and weaknesses.