FYI, it’s the EXACT same chip for Li Ion that are on these type little charger modules
http://www.fasttech.com/products/1005/10005926/1585501
HKJ did a review on those modules, a 1A due to the thermal control in the chip at 1A it “fluctuates” maybe a little heatsink or something on that chip might help, he said at 500mA charge rate it was very solid
So the review from above is the review for the “charge” pattern on the Miller