My battery fails to charge when it's inserted in the charger, accompanied by a red flashing LED light. 

The LED light on the charger is blinking red when I try to charge a brand-new battery.

My battery, which was kept in long-term storage is not displaying any IMPRES information either on the charger or the radio. 

The most common reason for these symptoms is the battery being in a deep discharge state as a result of improper care.   Motorola Solutions Inc. (MSI) ships all Li-Ion batteries at a state of charge less than 30% of their rated capacity in compliance with the International Air Transport Association (IATA) policy.

Therefore batteries should be charged within 1 month of receipt in a Motorola-approved charger. Failure to do so may result in a battery getting into this deep discharge state.  Any battery under 4 volts is considered deeply discharged state.  NOTE: Charging in a non-Motorola charger may lead to reduced performance and battery damage.   

In addition, if new batteries are going to be put into long-term storage they should be maintained properly while in storage.  

• New batteries that will be stored should be charged to greater than 50% (but less than 100%) state of charge within 1 month of receipt.  Every 9 months, batteries must be recharged to greater than 50% state of charge.
• Batteries removed from service for storage should be charged to greater than 50% state of charge. Every 9 months, batteries must be recharged to greater than 50% state of charge.
• Do not store batteries attached to radios or host devices. This will minimize the current drain on the battery.

NOTE:  The above information on storage and care can be found in the Motorola Solutions Battery Use, Storage, and Care Recommendations.  Following these recommendations should prevent a battery from deep discharge.  The Motorola Solutions Battery Use, Storage and Care Recommendations can be found: https://www.motorolasolutions.com/content/dam/msi/docs/products/two-way-radio-accessories/batteries/brochures/motorola_solutions_battery_care_tips.pdf

Impres Battery

Not all batteries in this condition will be recoverable. Batteries not recovered should be replaced by the customer.  The batteries in this deeply discharged state (<4v) may be able to be recovered following the steps below.   

For the best results use a multi-unit charger (MUC) running the latest firmware.

1.  Clean the battery contacts to ensure proper contact with the charger.  
2.  Insert the battery into an Impres charger 
3.  If you see a solid red LED it signifies it is charging.   
   1. If the battery has never been placed into an Impress charger it will start the initialization/calibration process.   This may take up to 12 hrs, 
4. If MUC displays "Battery Voltage is too low - Waiting to Charge".
   1.  Insert and remove the battery 5 times leaving it in the charger.    NOTE:   When you insert the battery into the charger, it will "check in" with the charger and gradually add voltage to reach approximately 4 volts. The same process occurs if you leave the battery in the charger. This charging process may take up to 12 hours. It's important to note that a solid red LED light indicates that the battery is charging. 
   2. If the battery has not charged in 12 hours then repeat these steps in another pocket of the MUC.
5. If the battery has not successfully charged after following these steps the battery must be replaced.