When battery is placed in charger, red light blinks and battery does not charge

If the radio will charge on one charger and not the other, the one with the blinking light is bad or has a dirty or defective battery contact. Check your charger for debris and clean your battery contacts with a pencil eraser and try charging again. If this fails, replace your charger.

Best regards.

check output on transformer, 2 check pcb ,could be a regulator

You do not mention which model of Motorola radio you are charging, so this will be basic information: Typically if a charger blinks red when the battery is initially put on the charger, you either have:
1) Dirt contacts. Solution: Clean with pencil eraser, both radio and charger contacts.
2) Shorted or bad battery. Solution: Replace the battery.
3) A bad charger. Replace charger.

Some simple troubleshooting might determine your problem. Try the battery on a different charger and see if you get the same blinking light. If so, you have a battery issue. If the problem disappears when you place it on the known good charger, then you know you have a charger issue.

Best regards.

I had the same problem with flashing red lights. Both sides on a four battery charger. I swapped the batteries to another charger and the batteries were fine. They charged normally. I put some different batteries in the charger and the same flashing light situation. Those batteries also charged normally in a different charger. I looked closely at the back of the charger and, low and behold, "made in China". Why does that not surprise me. The bottom line, it may not be a battery issue.

Try a new or other charger, problem may be with the charger.

As you know, solid red on your charger means that the battery is fully charged and the BLINKING red light means the battery is charging. Unless the light is blinking irradically everything is working the way it is supposed to. If the light is blinking irradically, the battery may just be too hot or too cold to charge ( like when you are driving many lags and your battery dies) and in this case simply wait 15 minutes to charge. If you get a fast blinking light still, the problem probably is with the battery.

It is supposed to stay on. If it is blinking then your battery has gone completely dead. You can force the charger to charge the battery by applying a voltage (AA battery w/ wires worked for me) across the charging terminals while inserting the battery. You'll have to take the charger apart for this.

For others with the same problem (flashing red light won't go off)...make sure you FIRMLY PUSH the battery down onto the charger and engage the latches. Simply resting the battery on the charger will not work.

Try those hereunder mentioned.

1. Clean the battery charger pin & battery charging point too. If the red light still blinking then replace your battery. Your battery life is finished then.
For confirmation try to charge your battery from others people charger or ask some same battery and fixit in in your charging place. You can short out then which one have problem.
Thanks & waiting for your feedback.

the steady red light showing when in charger shows that
it is charging. the blinking red light when taken out of
charger or turned on and off means it is not fully charged.
leave it in charger till red light turns green.