nice finds. The CMTP02 I have is definitely better than the PWM variant I bought previously, so even if it's a PWM type the algorithm is much better. I might try out one or two of those other variants from that seller (like 281134380669 ) and see if there's much difference.
The one big thing that they all don't really do well is manage voltages on the battery charge cycle based on your battery chemistry. It'd be great if you could set / adjust proper charge parameters for the battery you use, but then again that's a 5x or more price increase and impossible to justify for a project like this.
The one big thing that they all don't really do well is manage voltages on the battery charge cycle based on your battery chemistry. It'd be great if you could set / adjust proper charge parameters for the battery you use, but then again that's a 5x or more price increase and impossible to justify for a project like this.