pianotuna wrote:
I'm sure Stircrazy would subscribe to this view point--but BattleBorn deliberately derates their 100 amp-hour to 100 from a "real" 120 amp-hour.
So far as I am aware the rest of the Li makers don't protect the end user this way.
Could it be the battery management systems are keeping the bottom 20% from being used?
I know some are, it may be to protect the bottom end, but lets talk about this.. people are misconceving why you would want to do that. there are two reasons that stand out in my mind.
1 at a 100% depth of discharge the life span on LFP seams to be 3000 to 4000 cycles depending on the manufacture and format, still a long time. by limiting your usage to what people are thinking as the bottom and top you can raise that cycle life time to 6000 to 8000 cycles. and one more thing about the cycle life span of LFP its not like a LA battery where after you hit the cycle life san the battery is pretty much useless and only holds a surface charge, a LFP after it cycles out will still have 80% of the original capacity and will hold that for a long long time unless you physicly damage the battery, which is why you can buy used cells very cheep if you happy with 80% of the capacity.
this leads directly into the second reason a company could be doing this, by building 20% more into the battery if some one is very hard on a battery it will maintain the rated capacity after it cycles out and no one can come back on them and say your 100ah battery only puts out 80ah.
I think I have stated before its all to do with limiting there warenty exposure.
Steve
