Oh brother do I feel your pain
When I first started vape'ing, I started with a 510 and those silly little thumb chargers with just that one little light drove me nuts. I had to charge it with that for a while, and then (if my wife wasn't around) I would stick the battery in my pcc to check it. The pcc has 3 different lights, so it was easier to tell if it was fully charged.
Now the good news (maybe). I have a couple of 510 thumb chargers that actually have two lights in them. While it's charging a blue light flashes on and off and the closer the battery is to being fully charged, the faster the blinking. And then it turns red and stays red.
I've been wanting to list them as "colorblind friendly" but thought that I was the only one. guess not
I haven't ordered from that same company in a while , but have been anxious to find out if they still carry them.
My doctor told me the same thing many years ago, that women aren't colorblind. Several ladies seem to have corrected that wives tale.
But if anyone else is reading this thread and really needs to be able to see the 510 charging, know that their are chargers out there that are easier to see.