I have a bit of a weird issue with charging on 2x NX-3220 radios I purchased from used-radios. They both came with KSC-25 chargers and aftermarket batteries. I couldn't get either of them to charge to green, though they did appear to charge it would always result in flashing red. They sent me a new aftermarket battery same thing. They also sent 2x KSC-25"LS" chargers which still results in flashing red, once or twice I was able to get green. I then purchased 2x genuine KSB-57L batteries and I am seeing the same issue with both model chargers.. KSC-25LS turns flashing red almost instantly. I turned on the radios and let them drain completely and it appears the KSC-25 charger does actually charge the batteries to full based on what I can tell but still turns flashing red instead of green in the end. Any ideas what could be the issue here?