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Simple answer yes they are compatable I just did it as I could not find any CD445 handsets.The manuals are downloadable from Phillips just search for CD445 or CD245 manual.Just press speaker button on 445 base for 5 seconds untill it beeps twice,then on new 245 handset menu/ register enter default code 0000 and bingo its live. Oddly the newer handset bases are 9v and not compatable with 445 bases which are 6v and have different contacts so you cant sit your 245 in the old base.My new 245 came with a new base anyway so no problem.
if you have had it a while chances r the batterys have had it even though they show full, try a new set, or even try standard batterys briefly while fone is not in charging mode to see if they work during a call.
You might have what is called "memory'. If you continue to replace the phone on it's charger after each call the battery will "think" it's empty, giving you s short charge time. Next time you replace the batteries (rechargeable) FULLY charge them then leave the phone off the charger until you go to bed at night.
I had a similar problem which I finally fixed. You did not say if any of your phones registered.
First try the following recommended by Uniden Support:
Your phone(s) should be fully charged before putting them on the main base.
Unplug the battery from the phone by removing the battery cover and removing the connector. Then, push the # and * key together and hold while you plug the battery back in (requires some dexterity). Continue to hold the two keys until you hear a confirmation tone. This will force the phone to reregister. Put the phone on the main base (if you are sure it has a fully charged battery) and see if it will reregister it to solve the problem.
That did not work for me. So, I followed the instructions to de-register the handset (even though it hadn't really registered). But, I also pretended like the Base was not available (because using the base in this step also failed).
1) Press and hold the hang up and # keys for at least 5 seconds.
2) Move the cursor to select Base Unavailable and then press Select.
3) Select the base you want to deregister from, press Select and then move the cursor to Yes and select.
This causes the phone to delete any of its base information.
At this point, again insure that your phone shows the battery is fully charged and if it is not, put it on the stand alone charger base (not the main base). With the battery fully charged, place it on the base and try registering again by placing it in the main base.
If neither of these approaches help, contact support at Uniden.com.
However, my problems were cleared when I cleared the handset with the second set of instructions.
it is possible to send it a request(email or call )before u have to specify very clear about the problem otherwise try first to charge fully and discharge it 2/3 times (u also have the manufacturers/products guarantee on some parts outside the guarantee teh product is buyed)
On a CD440 base you should see at least a single button wich serves to call the cell phone, for the case when we don't remember where left the device, that's the button that you have to press during 3 seconds. On a CD445 base, you can see more buttons has the images showed on Philips pages... the button as a nice sign on it: it as a point with some curve barsto the rigth side as meaning "echo" or "sound"...