The culprit: Among the two tiny metal disc-shaped battery connectors, which must stick a little bit out in the openings within the black metal deal with at the base with the pod, had been pressed slightly in to the casing. Overcharging can potentially degrade the battery's lifetime with time. https://cruzbtiwl.fitnell.com/76148197/5-simple-techniques-for-stiiizy-starter-kit-how-to-use