Mines puts out 20v on my volt meter. Will it damage a small 12v battery?
1239808
Mine did the same thing and my battery was dead after 6 week. had to replace the battery. I don't recommend this product .
728420
I tested the voltage when batteries were very low and fully charged. My controller did what the specs said. Good luck
685904
I just used a 12v adapter I had lying around. I cut the end off and used a multimeter to make sure the polarity was correct and hooked it to the board. Please, do be careful about the where you put the positive and negative. I remember reading on the net that this device won't protect itself from reverse polarity on the dc voltage. Meaning, the circuit board will be ruined.
1738462
Yes - You are correct. The battery will overheat and it can be damaged! Try using a thermostatically controlled outlet like Farm Innovators model TC3-3545 as long as the 120V receptacle (or thermostat) in the same general area as the battery.
687980
I had the same problem. So, I tested the battery with a multi meter and it tested at 4 volts dc. That was the condition it arrived to me in. I tossed it in the trash and bought an equivalent from RADIO SHACK. It tested at 12.3 dc volts. I hope this helps.
1500971
I used mine on a 4 unit - 6 volt battery bank in my RV. If they make a unit for 12 volt batteries I don't know. Contact the manufacturer
2159019
Absolutely NOT! The voltage on battery tools must be the same as must the configuration of the physical battery. 12 volt battery for a 12 volt tool; 18 volt battery for a 18 volt tool; 20 volt battery for a 20 volt tool; etc., etc., etc. Use the wrong voltage and the tool will not run or if higher could simply burn out.
636602
You should have no problems with that battery. I hooked up the light to a 12V supply I have. The light uses 0.8A.
1300906
Had mine on a 12 Volt ATV battery for 4 months . Does not seem to be any problem. It charges so slowly I don't think it could hurt the battery. But does get the job done. Hope this helps.
1800218
It's all about volts and amps. You can select a voltage that matches yours, but the lowest amperage is a bit above yours. No way to know if your battery will tolerate the over-amperage. To be safe, find a better match.
353901
How did you try to measure 24 volts? If you used 2 twelve volt batteries in series make sure they were connected one + lead to the other - lead. Or try to measure 3 nine volt batteries snapped together. You should get 27 volts. I think there is a calibration pot on the back of the meter. It is very small and you will need a jewelers screwdriver to adjust it. Make sure the red lead goes to the + termingal of the battery. Try again and let me know. You could have a bad batch of meters. Mine worked very will on my power supply that goes up to 27 volts. One last thing...are the 24 volt batteries you are measuring good batteries? The meter might be telling you that they are not. Hope this was useful. Also be aware that all meters have a percentage of error. Some are + - .1% + - .01%. No matter how expensive the meter it will have error tho very small. The smaller the error, the larger the price. These cheap but beautiful meters are good enough for battery monitoring. I wouldnt use them to build a computer power supply.
806833
Dude just charge it until the meter reads full it will not hurt your batteries. Joe
1398307
I don't know but it should be on 5V. I don't think it can run too long at 12 V.
1128140
I am not sure, but it looks like your battery is a 14 Volt battery, then you should use 14 Volt battery, The Voltage is the most critical issue here.
964460
Yes, set it on the 20V scale to measure the car battery voltage since the batter voltage is nominally 12 VDC. It would be hard to use it to learn much more about your battery. Battery weakness would show up under heavy load when high current is being pulled out of it. Voltage for a weak battery would dip under such a condition but this would hard to create without sophisticated test equipment. You can get your battery tested for free at places like Auto Zone.
1710543
The 20 volt battery will not fit any 18 volt equipment. So he was correct. You have to match the voltage of the battery to the voltage of the equipment.
227
I have had a Bull Dog ready to bark and bite intruders for more than five years and have never had it adversely affect my 12V battery. Test your battery and check the date you bought the battery.Dean