How do I test A battery?

If the codes for your Digital Lab DLU-5004B universal remote are not working with your RCA TV, there are a few things you can try to troubleshoot the issue:

1. Check the manufacturer's website: Some manufacturers may have updated or additional codes available for their TVs. You can check the manufacturer's website to see if there are any new codes that may work with your TV.
2. Try a different code: If the codes provided in the remote's manual are not working, you can try using a different code for your TV brand. You can find a list of codes for different TV brands online or in the manual for your universal remote.
3. Check the remote's battery: Make sure the remote's battery is charged and properly installed. A weak or dead battery can cause the remote to malfunction.
4. Reset the remote: Resetting the remote may help resolve any issues with the remote's programming. To reset the remote, remove the battery and press any button on the remote for at least 15 seconds. Then, reinsert the battery and try the codes again.
5. Check the TV's compatibility: Some TVs may not be compatible with universal remotes, in which case you will need to use the TV's original remote or a different universal remote that is compatible with your TV.

If these troubleshooting steps do not resolve the issue, it is possible that there is a problem with the remote or the TV itself. In this case, it is recommended to bring your TV and remote to a professional for further diagnosis and repair.

i don't know. battery may be dead in remote or in wrong way. please check batteries. if all tests ok, consider another remote at <https://www.ebay.com/itm/Hunter-Universal-Ceiling-Fan-Remote-Black-Receiver-K5579-01-NEW-/383158875857>

Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. In some cases, the remote control might need to clean.
http://electronicshelponline.blogspot.com/
http://homenol.blogspot.com/
http://remotesearch.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly.
https://youtu.be/wUpnETSm6_k
https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean]
https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]

Assuming it is the original remote, that is all the testing possible. Taking out the batteries, let it sit for 30 seconds and put in fresh batteries is my only other idea. It sounds like the remote is defective or was dropped or has liquid damage. If you have a universal remote, program it for your TV and try it. If this IS a universal remote, sometimes you need to try different programming codes. Best of luck!

Check the remote control for its infrared emission. If you wish to get more details about how to check a remote control, check the sites linked here. Before doing anything, check the battery contacts at the battery compartment of the remote control, for any rust or dust accumulated, which prevents a good battery contact. Clean the well before testing.
http://remotesearch.blogspot.com/
http://electrohelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.

There is no key to push to test the batteries. Just replace with new batteries to see if that helps.

Check and replace its infrared emittor LED.

Remove the battery and wait for 30 seconds. Reinstall the battery and test. If the problem happens often, try to re-download the programming. Log into your account and click "Update Remote".

Check ur universal remote manual for ur tv codes.Re enter ur tv model universal codes.Ur remote should work again.Try website like 1-800-Remotes factory original.Buy an exact remote to ur tv original remote.Never care for codes agian,because u have the original remote.

ok, the solution for it is very simple.
get it to autozone and ask them to do an alternator test to see if the alternator is producing energy if you are the kind of person that doesn't know anything about cars.
if you are a semi-skilled person then get a voltimeter and test the battery with the car on. and the positive lead with positive and negative with negative, it should read about 14 or more.
if you go to autozone or o'reilly then ask to see the voltage on their little tester. and if you see a voltage of around 14 then you can be sure that the problem is not your alternator.
thank you
if your alternator test fine then the next step would be to check your battery. turn the headlights on with car off, then voltage should not go below 10 volts when you plug the voltimeter.