Apple iPhone chargers are not inherently unstable and only kept from bursting into flames while charging by the circuitry attached to them.<p>A lithium ion battery is prone to a runaway thermal reaction if you charge it or discharge it too fast or too far. [1][2] Circuitry in the charger and usually directly attached to the cells in the battery permanently break the circuit if the battery voltage or current exceeds a pre-set range.<p>This is not like the Keurig k-cup DRM where they are &#x27;ensuring quality&#x27; by forcing usage of Keurig-only supplies. This is a life safety and brand protection issue that an improperly built battery can jeopardize both. The consequences are not a bad cup of coffee.<p>[1] <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=UaCMevegaiA" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=UaCMevegaiA</a><p>[2] <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=6M4YuMYGclM" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=6M4YuMYGclM</a><p>edit: added links to youtube videos