CNHL China Hobby Line

[@danny_cunningham]

I always stick to named brand batteries but I was thinking of giving these a try. Thanks for the video

[@mlentsch]

CNHL is a fairly well-known brand.

[@malmbergtube]

Why do you need to cut it open to measure each cell's resistance? Can't your charger measure that? Most lipo balance chargers can do that...

[@chriscflint]

You are correct that you can measure the voiltage without opening the battery. But in order to check resistance you need to access each cell separately.

[@malmbergtube]

No, they can also measure each cell's resistance via the balance cable.

[@BelovedFPV]

Have you tried reaching out to their support team? They have always been very good to me. I'd give them a shout and see if they can help :) Good day.

[@chriscflint]

I specifically added them intot he comments to see if they respond.

[@freddan6fly]

You used way to high resistance value when you tried to measure Ri. Ri in my batteries are between 0.1 Ohm and 0.6 Ohm. To measure with 100 Ohm gives no info.

[@chriscflint]

I was trying to measure 3 to 4 volts on each cell and then collectively add the resistance values up.

[@freddan6fly]

@@chriscflint Actually now I double checked my battery DB. Ri for my 1300-1600 mAh batteries @40A-100A are between 4-10 mOhm. I suggest next time, you either measure with a good charger (i got two old iCharger 208B), or a resistance in mOhm range. U need at least a 350W charger. For added accuracy with an external resistor port, plus that resistor at 50W+, 0.01 Ohm. You also need a fan to cool that resistor. I know these things because I got an University degree in Electrical Engineering.

[@chriscflint]

Hi Freddy thank for the additional comment. The charger I use is rated to 350/650 watt (AC/DC input). I do not know if you saw one of my comments but I had another 4S fail yesterday exactly the same. Fully charged, 16.8Volts measured with a multimeter. As soon as the drone took off the voltage started dropping instantly and I had no option but to land immediatly. When I returned home I checkd its voltage and it read just a bit less than 16 volts. From this I suspect the problem is the battery internals just cannot output the required Amperage that the drone requires to just fly. Wires and that all look sufficiently sized in square mm for the current but internally some issues must be present. I will attempt to send this one back to CNHL to see what they say. Cheers@@freddan6fly

[@freddan6fly]

@@chriscflint Cheers. Don''t take this as criticism of your conclusion of bad batteries. There I don't doubt you. Just that your method could improve. Happy 2024.

[@mlentsch]

hmmm.. I've gone through many of these with no problems. You do realize that the "C" ratings on all lipos are utterly dubious, right? While CNHL aren't the best or lightest, they are a good value option - esp when you can get them on sale. I've had one with a bad cell which they promptly replaced. Perhaps you're getting fakes. Where are you buying them?

[@420247paul]

what do you mean dubious C ratings is a rate of charge or discharge its dubious because they are shit company 50 percent failure rate and they chonking fatasses

[@chriscflint]

Hi Mike, I buy direct from CNHL. Today again on my 7" another 4S went from 16.8 to less than 10 volts in less than 15 seconds so another one in the trash. I also flew 3 of their 6s batteries with no issues??

[@mlentsch]

@@chriscflint ... unless the had a bad run - I've never tried those particular batteries. This sort of fiasco is certainly not "beneath" CNHL... but, I've never heard of anything this bad... unless you're doing something seriously wrong... lol