For more than 2 years now, I have been working blind in my 18650 battery power wall project. God knows I needed a battery capacity tester. So when I had a little money, I ordered for this as. I just wish I should have gone for Lii500, but I order for this as it could serve many purposes.

So after receiving the product, I tested it. The first I noticed about it was its inaccuracy in voltage readings. The manual said its 0.05v off, but at time, it was more than that. Then the real capacity test were bad.

In my years of building battery banks, I wouldn't say it's actual capacity but I could guess. So when I see readings being about 2 times lower than what I guess it should be, then it really disturb me.

The video reviews I saw on YouTube acknowledges that you may end up getting a bad product. One reviewer suggested getting about 3 or 4 (since they are cheaper compared to other capacity testers) so that if you one is bad, you throw it away. But here is the catch, I don't have the luxury of throwing away 40usd,waybill inclusive (about 20k) in this hard economy.

I have videos of the capacity test. Maybe I'll upload them to my YouTube channel and share the link.

The product is in dispute at the moment. I needed to return it and get full refund from the seller. But here is the real challenge, it seems the cost of sending it back is way higher than the cost I paid for the product waybill inclusive.

So I'm confused. What do you my tech guys think? Have you had similar experiences? How did you go about it? I wish this product was good, I wouldn't want to return it, but I cannot rely on it.

Picture is of the product

Update:

So I had an agreement with the seller. I offered to keep the product while he returns $10 to me and he accepted. While not the outcome I wanted, at least I didn't lose all. To return the product would have cost me more than 20k naira.

Maybe I'll be able to have a fix for it in the future or recalibrate it. I don't know for now. Maybe it will be useful in some other way, the future will tell. But anyway, I'll just leave it at that.