Question about Kenwood ProTalk UBZ-LF14 (14 Channels) 2-Way Radio

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RECHARGEABLE BATTERY IS NOT HOLDING A RECHARGE

I charged both of my transceivers and one doesn't seem to hold a charge. Where can I get this repaired or replaced?

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This sounds like you have a battery that has gone bad. If this is the case then it is possible that your local dealership can sell you a new battery. If they can't then try searching for the battery number on ebay or another website that sells batteries.

Patrick

Posted on Nov 21, 2008

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when charging a new battery for the FIRST time, most require a full 24 hours to be properly charged. Failing to do this will drastically diminish the life of the battery. If you did fully charge the battery the first time, another issue is recharging after EVERY use vs charging when completely drained. Battery will develop memory (although the manf. will say other wise). If you charge after every use and have only used a third of the charge, after a few time of doing this, you will notice that the battery will not last as long. Try one more battery in just one raido. Fully charge it the first time and only recharge when COMPLETLY drained. If the battery is still not holding a charge, it is most likly a short in the radio itself. Return it.

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Possibly a bad volume/on/off volume potentiometer. Try using canned air around the volume/on/off knob to remove any debris down along the shaft. If this does not help, your unit may need repair. Do not use any chemicals, cleaners or solvents on the shaft, only use air.

Clean your internal battery contacts on the batteries and the radio with a pencil eraser to assure good connection. If you are using rechargeable batteries, try charging the batteries again.

If this does not help, your unit may need repair.

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Hi Patrick,

Are you using rechargeable Ni-Cad batteries?

If so, buy Li-ion Batteries, Ni-cads have a memory and will recharge from last charge only, rather than fully charge.

Lithium Ion Li-ion batteries don't have memory issues, and therefore will recharge fully.

These are available as rechargeable types so, look for the rechargeable types.

I hope this has been helpful.

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1 Answer

Radio shack walkie talkie 21-1914 replaced batteries will not charge


Hi pearl,

A simple problem to solve at last!!!

Inside the battery compartment you should find a switch, which indicates Recharge/Normal, make sure you select recharge if your using these batteries, otherwise no charging occurs.

If this does not work, take out the recharchables and select normal on switch, place fully charged normal batteries into the compartment, making sure you put them in the right way around, close the flap and turn on the radio, if this works, then your battery switch is faulty, however, you can get lithium ion batteries, which will last longer than most other high duty batteries.

The cost of getting these radios is not worth the money, unless you are technically minded and buy the repacement switch and repair it yourself.

Otherwise try all of the above, and remember, when charging batteries that are rechargeable, never leave the radio on, as this can wear out your batteries quickly.

I hope this advice is helpful to you.

Best regards,
Peter

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1 Answer

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Low, defective, or poorly charged battery. It takes more energy to transmit than to receive. On a low battery you can sometimes listen (receive) all day, but one press of the PTT and your radio will shut down.

Solutions:
1) Try radio with a known good battery, or swap the battery from the other radio for a true test and see if the problem leaves.
2) Recharge or replace rechargeable batteries every 18-24 months.
3) Clean all battery contacts with a pencil eraser to assure good connection before charging.

If none of these solve your problem, the radio itself has an issue and needs replaced.

Best regards.

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1 Answer

Is it ok to leave our walkie talkies in the dual charger on weekends etc or does it damage the rechargeable battery packs?


The charger should have a built in circuit that will shut off when fully charge, but if it doesn't then the battery will feel supper hot and it is bad to over charge batterys and packs. It cut down on life time.

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1 Answer

Where can I get a new set of rechargable batteries for my cobra microtalk cxt275


The Cobra CXT275 radios can operate on any type of battery (Alkaline, Ni-Cad, NiHM). Each radio uses 4 AAA batteries. Only special rechargeable batteries can be recharged in the actual radio (see below)
If I remember correctly, they come from the factory with NiHM batteries rated at 300mAH. "mAH" stands for milli-Amphere-Hour and it represents the storage capacity of the battery. (The larger the mAH, the longer run time of the battery)

You have 2 options: A or B
Option A) Buy a set of Nickel-Metal Hydride AAA rechargeable batteries and a external battery charger. When the batteries die, pop them out of the radio, and charge them in the external charger. When they are recharged, pop them back in the radio.
Option B) If you want the ability to charge the batteries in the radio, using the "drop-in charger" then you will need modify the batteries so they can charge in the radio.
Follow these steps: You must be somewhat electrically inclined to do this...Note: By doing this you are going to void the warranty of the radio and new batteries that you just purchased.
1) Buy a set of Nickel-Metal Hydride AAA rechargeable batteries. You can probably find some rated at 600 mAH (this will extend the run time)
2) Looking at the back of the radio with the cover removed, there are 4 slots for batteries.
3) Looking at the battery slot on the far right, you should notice 2 contacts for the negative contact. The one on the bottom, is the contact for the radio to receive power from the battery. The one on the side (about 1/8" inch up from the bottom contact), is the contact for the charger to recharge the battery.
4) You will need to modify 1 battery for each radio. Somehow you need to bridge the bottom contact with the side recharge contact.
5) (look at the negative end of the cobra factory batteries and this should help you realize what you need to do) depending on the manufacturer of the new rechargeable batteries, you may be able to use an X-acto knife and remove 1/4" of the plastic wrapper from the bottom of the battery on the negative end. This should reveal the metal shell of the battery that can mate with the radio's side recharge contact.
If it does not, you need to find another way to have it mate with the bottom contact. You might be able to use some Aluminium Foil to bridge the bottom contact with the side recharge contact. Be sure the Aluminium Foil does not touch the positive contact of the battery to the left! You could have an electrical short!
6) Insert the Modified Battery into the right slot.
7) Insert the other 3 new batteries into the other slots. These do not have to be modified. Only the right most battery needs to be modified.
8) Drop the radio in the charger for the batteries to charge. The red LED on the charge base should come on. If it does not, then the side recharge contact is not making a good connection with the negative battery terminal.
9) If the red LED comes on, then the modification works. Let the batteries charge for 24 hours for their first initial charge.
10) When the batteries die after radio use, then charge them for about 12 - 16 hours in the drop-in charger. Do not let the radios sit in the charger for long periods of time. That can destroy the batteries. Take the radios out of the charger when the allotted time has passed.
11) If you hardly ever use your radios you will want to drop them in the charger for about 8 hours every 3 months. This will keep the batteries fresh without damaging them.
I hope this helps, Thomas (Electrical Engineer)

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1 Answer

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Best regards.

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1 Answer

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What you have been using are consumer grade walkie talkies. The rechargeable battery packs in them should last a full business day, unless you are in a high use area. This being said, it is also possible you might need to replace the rechargeable battery pack as they usually have just a one year life expectancy. As they start to fail they will go less and less time in a day.

To answer your question about a radio which will go a full business day, any of the business division Motorola handheld radios would work. Radios such as the CP110, BPR40, CP185, and CP200 are all make to go a full day and sometimes more. Their battery packs depending on chemistry would also need to be replaced every 18-24 months.

Best regards.

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