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I have 2 18 650 Samsung 25r batteries that I charge as a couple always yesterday one of the batteries read 4.21 volts and kept charging on a smart charger is that bad what was going on is it the battery is bad or the charger is bad please answer before something bad happens I asked a guy on YouTube that does reviews on batteries and said it happens sometimes up to 4.5volts?

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closed as unclear what you're asking by winny, Lundin, Scott Seidman, Dwayne Reid, MCG Jan 8 at 15:47

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  • \$\begingroup\$ My guess is your multi meter is less accurate then the charger... \$\endgroup\$ – MadHatter Jan 7 at 14:30
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    \$\begingroup\$ This isn't really answerable unless you provide more details. Modern chargers have NTC supervising and shouldn't charge past the specified voltage for a single cell and/or battery pack, as in this case. \$\endgroup\$ – Lundin Jan 7 at 14:44
  • \$\begingroup\$ the battery should not overcharge at all Do yourself a favor and go to YouTube and search batteries exploding or li-ion battery overcharged If you suspect that your charger or the battery could be faulty try another multi-meter or try another battery or charger do not let the batteries heat up in the charger by over charging it \$\endgroup\$ – Tjaart van aswegen Jan 7 at 18:16
  • \$\begingroup\$ It was the charger the zanflare C2 too bad it was such a small cute compact charger with real time reading now I had to get the new Nightcore I forget the name but it's the new one it'll be here a couple days also I had to go to a company that's authorized dealer for the batteries and chargers which is very hard to find but I did it so anybody new to chargers and batteries always pay the extra money to get a better smart charger battery could be the difference between tragedy and safety \$\endgroup\$ – Tony Jan 9 at 22:45

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