This should be emphasized. It’s not even easy to get flat tops out.
They probably did this to keep it from moving around but when you have two cells in there I basically have to bang the other end and let them come lose. A better solution would have been a bit more flex in the terminal and then maybe some foam on the battery cover side to keep them in place from that angle too.
Can I use different batteries at the same time without any risks, e.g. one Sony VTC6 and one Samsung 35E or would this have a negative effect on one or both cells.
I mean none of the batteries I have personally will fit. The only unprotected batteries I own are 30Q's but they are button tops. Most of my batteries are protected.
Thank you! What would happen in following situation in the PB2?
Mode: Discharge (e.g. charging up a phone via USB)
Channel 1: Sony VTC5A, capacity 2.600mAh
Channel 2: Samsung 35E, capacity 3.500mAh
Now, being discharged in parallel those cells would always have the same voltage, right? Sorry for raising a stupid question but how does this work with cells of different capacities and what happens when both cells reach something like 2.8V? I always thought it’s no good idea to combine cells of different brands and different capacities regardless whether they’re being used in parallel or in serial.
Think of it as two water containers in parallel, one with a larger diameter than the other. An imbalance would be created IF they were being drained at the same rate, by a separate tap at the base of each, but that is not equivalent to what is happening here.
In this scenario the containers are joined by a thick pipe at the bottom, and are being drained by a single tap. Their levels will stay exactly the same until they reach the cutoff, no imbalance, no issue.
Different scenario for the charging circuit though. Take that same diagram and put one way valves leading from the central pipe to each tank , so they can be at different levels but can only fill, not empty, so they won’t affect each other at all.
Now pump the liquid in slowly, it will go to the point of least resistance, filling the more empty container first, then keeping both at the same level and filling them together when the pressures equalize.
In both scenarios, the level or pressure is equivalent to voltage, and the volume of liquid and container is the charge and capacity respectively.
Im loving my pb2! My previous power bank holds 8x 18650s and is big, bulky, and doesnt charge my phone as well even though it claims 2 amps output.
This pb2 fits in my pocket, my phone charges fast, and its got a slick design. I often fidget with the magnetic door while charging my phone and its very satisfying for some reason.
I don’t know how the ports negotiate charge rates, but I have a 4 bay Soshine which is probably a rebadged Tomo, and the curious thing is that there is a 1A and a 2A output port, yet the 1A port uses a faster rate with my phone than the 2A, but only the 2A will deliver good current to my tablet.