Question about Motorola T8500 Two Way Radio

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Immediately off the charger the unit shuts itself off as soon as

We have 42 radios tha t staff use to communicate and one of them tuurns itself off right after it comes off the charging cradle. it is frustrating and would like to know if there is a setting we are unaware of or what.

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You did not mention the age of your rechargeable batteries. If the batteries are more than 18-24 months old, you may need new batteries. An easy test would be to switch a known good battery into the radio with the problem. If it solves the problem, replace the battery.

Posted on Jun 15, 2009

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Posted on Jan 02, 2017

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Borrowing either a universal power charger, or the charger from someone with a similar laptop, can eliminate some of the possibilities unless it is indeed your charging port.

If after plugging it in, the battery charges you know you had a bad charger. If the battery fails to charge, you know its time for a new battery. Again this only if the port itself is not bad.

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My motorola sx800 goes on but when you push the talk button to communicate it always goes the same way like how you turn it on first. so i hope i can get some answers for my motorola walkie talkie.


It sounds like a bad, defective, or low battery. It takes more energy to transmit than to receive, or to be idle on standby. Pressing the PTT button to transmit with a low or bad battery would cause the radio to shut down or nearly shut down.

Try another battery pack in your radio or swap batteries with a known good unit to confirm the battery is the problem.

Other problems might include the battery being poorly charged. Check your charger. Or you could have an overall problem with the radio itself. This is a non-repairable unit, so if it is the radio you would need to retire it.

Clean all your battery contacts with a pencil eraser to make certain of a good connection.

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I have a two way motorola sx800r. I bought 5 sets of the radios. I can hear from any radio. But only one radio will transmit to the rest of them. It has to be a setting. I just don't know which one. All...


We could not immediately find a manual for the SX800, but here is a link to the SX700 which is very similar. http://www.giantintl.com/ContentManage/manuals/Moto/SX700.pdf

With the radio unlocked: You should check your Qt filter to see that it is also programmed the same. It is recommended you use it in the off or minus position for best communications. If this does not solve the problem, try setting all the radios back to the basic Channel 1, Code off, Qt off, position and see if they will work together. Shut off any special features such as vibra call and call alert, as these when not used correctly can also cause issues with inexperienced users.

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While I would be suprised at the battery going out within a year or so it is not unheard of. You may have to replace the internal battery pack. The unit is new enough your only source is probablly going to be Garmin. They might replace the battery under warrenty or out (if you talk nice).

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I would suggest you take the unit back to the repairer immediately , they MUST fix the problem for you on their cost.

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I had this happen, and I solved it by connecting it to the car charger for a while, then bringing it in and connecting it DIRECTLY to the AC charger for a full charge. (This assumes the battery is not just kaput.)

Here's what I think happens: The AC charger doesn't have enough current capability to run the unit by itself AND keepp the battery charged (bad design), so, if left continuously ON, the battery will eventually drain. In this state, if you shut it off, the unit senses a low-battery condition and will try to charge, but the charging circuit tries to draw too much from the AC charger and the voltage droops (causing the whine) to the cutoff point (causing it to stop charging, another case of bad design). The car charger has more current capability, so it gets the battery charged enough to use the AC charger again.

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