Question about Motorola PMNN4077 Lithium Ion Battery

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Need to test motorola PMNN4077C batteries to diagnose which are still useable. There is no purpose made battery checker for this model besides the flashing red/green light on the charger. I have access to a digital multimeter but do not have enough information about the battery to use it

Posted by Anonymous on

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  • Master
  • 623 Answers

Only a Motorola service center or certified repair shop can test these. There's nothing you can do with a multimeter that will test them.

Posted on Nov 07, 2014

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Posted on Jan 02, 2017

Agent Ken
  • 250 Answers

SOURCE: MOTOROLA T5522 BATERIES

Hello mironas3,

A general rule of thumb when dealing with rechargeable battery packs is to take the capacity of the battery divided by the charge rating of the charger and then add an additional 10%.

Offhand I am not sure what the voltage / capacity or voltage / charge rating of the battery and charger are but you can determine that by examine the labels on both items. Let’s say (for example) that your battery is listed as 7.2 volts and 1,000 mAH and your charger is rated as 9 volts and 100 mA. (These are just theoretical examples. Substitute the numbers from your own items.) You would divide 1,000 mAH by 100 mA to equal 10 hours. Then add 10%. So you expect a full charge to take around 11 hours time.

Of course, actual charge time will vary depending on how discharged the batteries are when you start charging them. Since the charger that Motorola provided doesn't have a charge indicator determining when the batteries are done charging is a matter of making an educated guess. If you touch the batteries while they are charging and they feel warm to the touch, that's a pretty good indication that they are done or nearly done charging as once the batteries are topped off excess power will turn into heat. (Note that batteries in a charger should never be HOT. If they are ever more then just slightly warm, something is wrong with the battery or the charger or both.)

Also, just a word of warning here: remember to always use the correct manufacturer recommended charger. Substituting a charger with twice the charge rate to charge the batteries in half the time is not a good idea. Rechargeable batteries are meant to be charged slowly. Fast chargers exist but they typically have built-in circuitry that pulses the charge rate to prevent the batteries from overheating. Using the wrong charger can result in damage to your battery or radio or worse could possibly even lead to a fire.

Best Regards,
Ken
"Go Ahead. Use Us."

Posted on Jul 28, 2008

eradiostore
  • 1654 Answers

SOURCE: Red light flashing

It is either defective, or it has something touching one of the contacts causing a short. It would be best to replace the charger. Typically they are somewhat like a light bulb, they will burn out over time and need replaced.

Posted on Jan 18, 2009

eradiostore
  • 1654 Answers

SOURCE: problem charging

If you are referring to a flashing yellow light on the charging base, this is an error code. Either the 1) battery is bad, 2) not making good contact in the charger, or 3) very very low on charge. The solution for this set of problems is as follows: 1) have the company you purchased them from replace them, 2) clean your contacts with a pencil eraser, 3) leave the battery on the charger with the yellow light flashing for an hour or two. If the battery is just very low on a charge, it will come back to life and the light will change to be constant. If the battery is bad or shorted out, the light will continue to flash and you will need to get with the vendor you purchased the batteries from.

Other things which come to mind are compatibility issues such as you are using a different battery chemistry than you had before. NiCd batteries can charge on either of the two chargers available for the P110 (slow rate or fast rate). However, NiMH and Li-Ion batteries require a fast rate charger.

If you are referring to a yellow blinking light on the radio while it is in the charger. You need to shut your radio off. Radios should always be turned off when charging. If the radio is left on you will never have a full charge. Also, if you inadvertently press the PTT while the radio is turned on, while on a charger, you can cause damage to the radio.

FYI: There is no light to show "out of range" on the radio, unless you are possibly using a trunking or repeater system. A blinking light on your radio indicates the radio is turned on and/or there is traffic on your frequency. Your charger base light can be red, yellow or green. This indicates the charge cycle status. Flashing most always means some type of error.

Best regards

Posted on May 20, 2009

eradiostore
  • 1654 Answers

SOURCE: Motorola CP040 charging time

The rapid rate charger WPLN41__ will typically charge a battery in 90-120 minutes. Your battery should be depleted or nearly depleted when you place it in the charging stand. Be certain your radio is always turned off, when charging an attached battery. The NiMH battery will generally go 12-16 hours on a charge when new. If you work an eight hour shift, you might see if the radio will go 2 days on a charge. Later as the battery ages, you will need to charge it nightly. (Think of putting it in the charger as putting it to bed at night.)

Rapid charging is necessary on NiMH and Li-Ion batteries. They require a "hotter" charger, a fast rate, to completely charge the battery. It will not harm this chemistry of battery. It is safe to leave the battery on the charger overnight, or for a weekend. We would not recommend leaving the battery on the charger longer periods of time, as that will age the battery and reduce its life.

(Sidenote: Frequent rapid charging will however reduce the life of a NiCD battery.)

Posted on Aug 12, 2009

eradiostore
  • 1654 Answers

SOURCE: ntn7143cr battery won,t charge

Clean your battery contacts on the battery and charger with a pencil eraser to assure good contact. Flashing red or flashing in general usually is the sign of a too low to charge battery, a shorted battery or a bad connection. In some instances, a battery will begin to charge once left on the flashing charger for an hour or so. Try this and see if the light becomes constant. If so, it is charging. If it still flashes, replace the battery.

Best regards.

Posted on Apr 07, 2010

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