[nakedrobot2]

because the manufacturers are not required to make them last that long. if they were required to, they would alter the chemistry / capacity of the battery instantly and this would be solved.

[Retric]

Is there a lithium ion battery chemistry that lasts 8 years after being manufactured and ~3,000 discharge cycles without significant (10+%) degradation?

[johndough]

LiFePO4 can (https://iopscience.iop.org/article/10.1149/1945-7111/abae37/... Figure 1), although I would still like to be able to change my battery.