Hi John,
I hope that you are doing well. Flashing red lights commonly means a failed CSB. The only other thing that I am aware of that will cause a flashing red charge light would be failed circuit boards in your batteries. However, I can tell you from past experience that a failed CSB can also cause your battery BMS to become damaged as well. If you would like to send your batteries in I would be happy to check them to see if they are working properly. I can also confirm whether your charger applied any charge to them or if they are discharged. If interested please send to 237 N. Church Lane Red Lion, PA 17356 and include your contact information with the shipment. Thanks!
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Warm Regards,
Jason Abel
Battery Builders / MTO Battery
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