do you need to install a battery in the device for it to work?
87794
Yes. A single AA. I'm also a little paranoid about this thing draining that battery, so I usually keep a little piece of paper between the contact and the battery until I need to use it. Would suck to not be able to test battery life if the battery in the battery tester is drained.
87795
It does not need a battery in addition to the battery you're testing with. It does need a battery for testing.
87796
Yes...Make sure you have fresh batteries to see if the Battery Checker has no other problems. Moisture (water, pet urine) of any kind will negate the unit from operating...I myself had to replace a unit because of a male cat ...Smile!!!I found that utilizing a 'sandwich bag' to house the Checker will safeguard it from the moisture problem. You could keep the AA Battery seperate from the checker and only inser it when you needed to check other batteries...
166982
no. But I have mine plugged in beside my chair. Just turn it on when needed. I have never put batteries in. If you travel you might want the battery option.
823657
You have to install the the other plug side to your battery! Your answer is yes.
2049006
No and mine never worked. The battery wouldn't charge. It would work if I left it plugged in all the time but than what's the point
1264432
It worked for me NOT plugged in. Try that. It is a terrific device. Make sure it is charged, then unplug and run it from the charged battery.
1564647
I never installed batteries but as I recall it needs them or the AC power to operate.
923214
No it must be plugged into an outlet to work, the Bluetooth connectivity is wireless though.
2202955
No. You will either need to purchase the battery pack it a large pack of AA batteries
801003
No. This device is SUPPOSED to charge a device that is plugged into it and runs on betteries (2 AA). It does not charge batteries.
1673149
It does work without battery, but display is dimmer. unless you use it right under a light
1454906
I assume thatis a typo. There is no battery required as this is a passive device. I am using it on 24 volt system.
2181534
Hi Beth, This device has no battery. You need to connect it to a power source. -Anthony
1719642
No. The battery must be removed, which is very easy, and put in a charging device.
1599895
No. Plug and play. Devices like these usually have a driver (if necessary) on board.
1250380
Not at all. Leave the batteries in in case you need them. Plug it in when you can.
968950
The question is irrelevant. The device simply does not work. Believe me, I tried. Domnot purchase this item.
1513754
It does take a battery so I would first make sure it's not dead and it is plugged in the right way. When I first got mine it wouldn't work cause I didn't have the app yet. It only works when you hve the app open and click on the button on the screen. Without the app it won't work. If it doesn't work after that it's broke so sen it back.