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I have a pair of COBRA PR4700WX radios that will not charge when put in the charger base. Originally these radios charged but have since quit charging the batteries.
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Check your charger and battery contacts. Cleaning battery contacts on the radio and charger with a pencil eraser will remove dust, dirt, debris, and hand oil which may cause the battery to charge poorly. Secondly, you might want to check that your charger itself is working properly. If you have a second known good radio you might try charging it on the same charger.
this is the sign of a damaged or dead battery pack. they can be rebuilt at Batteries Plus or replaced. I would also try alkaline batteries in the radio before spending money on new battery packs. Most rechargeable battery packs must be kept charged regularly, and should be fully discharged before recharging, or they will be damaged and end up with a limited lifespan. IF you are handy with a multimeter you can check to see that the charger is putting voltage out by placing the probes on the contacts while it is plugged in. especially if the cord is twisted or looks stretched, but generally it is the battery not the charger.
They are often fitted with rechargable AAA cells. These can be charged by putting the phone on the charger base. Obviously the base must be plugged into power. You could alternatively take the rechargable cells out and charge them in a standard charger. The radios will also work with non-rechargable batteries but don't try and charge them or use the charging base.
Will one of them charge? If so, use it to check the other side of the charger. If both sides will charge the good radio then take the battery out of the good one and put it in the one that won't charge. If it now charges, then the battery was bad. If you have a radio that won't charge in either side or on either battery then the power is not getting to the on switch. Check for corrosion. You can use a volt meter to check the charger terminals and see if they are putting out juice. Both sides should read about the same.
first confirm the battery is in properly. then your charger should have an output equal to your battery power, e.g. if the battery is 3.6 v make sure your charger is at least putting out that. make sure the contacts on your charger are making contact on your radio.
I have a Cobra HH-40 CB radio and am charging it as I type. The included charger is rated at 16V DC, 100mA. The pattery pack charges 10 AA rechargable batteries (the manual specifies NiCd, but you can also safely use NiHM). The 12V DC car charger included cannot be used to charge the battery pack, but can power the radio.
I have the Cobra Microtalk 4100 FRS radios with charging base. After changing the batteries with new nimh rechargables the charge light would not illuminate and the unit would not charge. I noticed the original batteries had a metal band around one end. This band makes a small connection inside the battery compartment on the first battery. Seems to be a cheap way to ensure you dont try to recharge the unit with non-rechargable batteries installed. I rapped a small piece of tinfoil around one end of the first battery in the new set then popped it back in and now they will charge correctly again. Dont try this with non-rechargable batteries! I would recomend buying original replacement batteries.
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