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Based on your links it appears that the older chargers were 1.2A and the newer ones are 1.0A, with some significant overlap. I tend to keep a few of the 1.2A with my travel gear and a couple of the 1.0A at home, where I rarely charge batteries. I weighed a few chargers and the 1.0A are lighter weight, though there have probably been some circuit and construction changes over the years within the 1.0A versions. Some countries may have different rules about chargers although designers usually try to meet the highest requirements at the time.
The P series batteries are debossed with 2INR19/50 on the edge, which I assume is like a 19500 if the numbers are in mm. There's theoretically another 12% capacity over an 18500 from that extra mm diameter. I don't find anything to indicate that size is new compared to the NH or any earlier battery packs. Mainstream companies like Canon tend to use the maker's minimum capacity values, which are at the lower end of the manufacturing target range.
I tested NH, P and EL batteries and noticed a few things. The NH and EL battery management cuts out by 4A. The P battery is still operating at 8.0A. I decided not to abuse it further.  The current profile test ramp started at zero and increased in 0.1A increments at 5 second intervals until the upper current limit or 5.6V cutoff was reached. My battery holder is constructed from a generic LP-E6 charging plate and does not have the lowest resistance since I originally put it together for capacity tests at 1.0A. (That's one reason I'm not posting the computer generated charts.) Interestingly the voltage slope is not that much different between the NH and P until near 4A, so it's not clear what if any difference there is in the cells or if it is only the battery management. Most likely the cells are more stable at higher currents even if the P cell impedance is only a little better. My NH batteries are from 2023 or earlier. Though only lightly used they can also make a difference.
The EL battery pack for the flash units is larger, but I'll mention it here since it uses the same charger and was tested in the same set. The voltage drop is substantially lower than that of the P or NH from 2-4A as you would expect for the high drain usage case.
EBH
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