Question about Califone CLS721 Wireless Headphone - Yellow 72.100 MHz CLS-721

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I suspect that the batteries in our 20 pairs of Califone Model 721 wireless headphones (yellow) are dead and will not recharge. Is there any way to take out the old batteries? They seem to be pasted inside the center of the black plastic circle within the earpiece that has the red and white wires leading off of it. Is there any hope of changing out the batteries so that the headphones can be recharged? Please respond to devans@tisde.org

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2 Answers

Where do I find the model number


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I need ni-cad battery specifications for Acoustic Research AW-721 headphones. I bought replacement ni-cads but they don't charge when the headphones are placed on the headphone cradle/charger.


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1 Answer

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Based on the manual you are supposed to get a cable that connects to the transmitter and that would be the charger, make sure that you get new rechargeable batteries because most products provide you with generic Chinese batteries and those would last just a few recharges.
I'm giving you a link to download the manual I'm not sure about the model but the principle is the same. (click on the support and manuals tab)
http://www.araccessories.com/ARAccessoriesProductDetail.do?ACTION_TYPE_ID=ACTION_TYPE_PRODUCT_DETAIL&ACTION_CATEGORY_IDSTR_CATEGORY_HEADPHONES&ACTION_PRODUCT_ID=AWD205
if it works for you don't forget to rate me
thx

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RCA headphones - nicad or alkaline batteries WHP141


BATTERY INSTALLATION AND INFORMATION
Your wireless headphone unit requires two rechargeable AAA batteries.
Rechargeable batteries are uncharged when you purchase them. Before
you can use the wireless headphones, the batteries must be charged for
16 hours. Follow these steps to install and charge the batteries.
Installing the Rechargeable Batteries
Take care to follow these steps to correctly install the batteries.
1. On the right headphone, locate the battery compartment (1).
Use the finger depression on the compartment to turn the battery
compartment cover counterclockwise to remove the cover.
2. Insert two AAA rechargeable batteries, carefully following the
markings inside to ensure the batteries are inserted properly, with
the + and - ends in the correct positions.
3. Replace the battery compartment cover.
Charging the Rechargeable Batteries
To recharge the headset unit, follow the directions below. Note: The
cradle/transmitter on the WHP141 is not a recharging cradle, although
you may place the headset in the cradle during recharging.
Follow these steps to recharge the NiMH rechargeable batteries.
1. Make sure the ON/OFF switch (2), located on the right headphone,
is in the OFF position.
2. Connect the AC/DC main power adapter to the DC IN power
supply socket (11), located on the back of the cradle/transmitter.
3. Plug the adapter into an electrical outlet.
4. Connect the charging cable (10), located on the back of the
cradle/transmitter to the recharging input (3), located on the right
headphone. The headphones can either be placed in the
cradle/transmitter or placed next to the unit. If the headphones are
connected correctly, the charging LED indicator light on the
cradle/transmitter (8) illuminate.

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I had a similar problem - after owning them for 4+ years, no sound we coming out, and no beeps -- nothing. The lights on the charger stand were on though.

I tried buying new rechargable AAA batteries and they were NIMH (nickel metalhydride?) and still didnt work. I borrowed a friend's pair of NICM (nickel cadmium?) AAA rechargables though and the problem was solved!

So, it would seem the some of the new chargable battery types might not work in older models of this unit (which is also called the RS 130 now in the US and Cdn web sites).

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4 Answers

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