Saw someone mention that BlendJets was dying on the charger due to the two 18650 cells within them being toast. BlendJets run a pair of 18650 cells, sitting somewhere around 3.7 to 4V when healthy. If one is cracked open and the voltage of the cells are significantly below that range, they are essentially done for that battery and you wont bring them back to life by leaving it on the charger.
In order to replace the cells, the new cells has to be spot welded together to maintain the battery; soldering directly to the 18650 cells can cook the cells. Thus, to replace the cells, one would have to purchase a spot welder, such as a cheap kWeld or an 18650 specific welder.
I cracked open a BlendJet last summer and found the cells to be mostly garbage; they were no-name, flat top cells with both cells reading around 1.2V. I might replace these with Samsung 25R or LG cells instead. The little BMS that is included in BlendJets is fairly forgiving and should not throw a fit at the replacement of the cells with fresh battery.
In order to replace the cells, the new cells has to be spot welded together to maintain the battery; soldering directly to the 18650 cells can cook the cells. Thus, to replace the cells, one would have to purchase a spot welder, such as a cheap kWeld or an 18650 specific welder.
I cracked open a BlendJet last summer and found the cells to be mostly garbage; they were no-name, flat top cells with both cells reading around 1.2V. I might replace these with Samsung 25R or LG cells instead. The little BMS that is included in BlendJets is fairly forgiving and should not throw a fit at the replacement of the cells with fresh battery.