Hobbyking 2-8S Cell Checker with Low Voltage Alarm
The Hobbyking 2-8S Cell Checker with Low Voltage Alarm features loud twin Piezo alarms to notify you once your cells reach a user defined voltage. You can customize the alarm to sound at a voltage between 2.7v~3.8v Per cell in 0.10v increments by pressing the setting mode button. This unit also features a handy built in LED display that will show the voltage of each cell followed by the over all voltage of the pack.
Don’t risk your model by flying on depleted batteries, at this price piece of mind flying cant be any cheaper!
Specifications. Input: 2~8S Battery type: Lipo/LiFe/Li-ion Cell Voltage Display Range: 0.5v~4.5v Total Voltage Display Range: 3.7~36v Alarm set values: Off or 2.7~3.8v
Different batteries will have different voltage settings. Older batteries will probably need a lower number. The main thing is that after your flight, the battery should not have less than 20% capacity! This, more than anything, ensures that your batteries will have a long lifespan.
I fly a quad using 3S lipos. The best setting I've found is 3.5V. When I hear the beep, I land. I check the battery and I have 20% capacity left, which is the level you should never go below if you want your lipos to last. The setting of 3.5V accounts for voltage sag when flying. Setting it higher means I get the beep before it reaches 20% capacity.
ya, all battery will have sagging when flying. if better quality & new battery then sagging is more minor than old battery.
mine set at 3.7v for my 450 heli. it will beep normally after 3 minutes. i fly another 30 sec ~ 1minutes, the volatge will approx 3.75 when i was landing... recommended for all RC Flyer..!!
Is it possible to hook up 2x 4S lipo to this at the same time? Like Lipo#1 pins 1-5 and Lipo #2 pins 1, 6-9?
It should work in theory, you would have to split the ground. I don't see that being an issue since you can hookup Lipos in parallel and series.
This could work with a split cable for the balancer plug. They got a bridge on the last plus of the first pack, to the first minus of the second pack. This way, all cell's are seriell, an the end for the checker has one minus an eight plus.
If you only plug in one battery or set up a lead to join both balance leads before this checker it disables the most important function of the cell checker. That is to monitor each cell individually incase one cell drops below your set voltage (above 3v) due to unbalanced batteries or faulty batteries. When the alarm sounds you can land and balance charge your battery preventing further damage to the low cell. The only way to monitor two 4S packs properly would be to use two cell checkers and at that price it is worth while.
This ist not all correct. The balanc plug ist a seriall connection. The fist is minus, second is plus of first cell and connected to the minus of the second cell. Third is the plus of the second cell and gos to the next cell. The monitoring works by substracting the voltage of the cell's bevor. So you can take a balanc split. This split connect the plus of the last cell from the fist pack to the minus of the first cell from the second pack. For the cell ckecker this looks like a 8S pack.
I just measured them again, several different ones, and the weight is only 13G INCLUDING the plastic case. HK states 23G weight because of the extra packing weight to ship them to us. It is in error to tell us they weigh 23G without the plastic case on them.
First plug on to Balancer Plug of a Lipo. The black cable of the Lipo must be on the minus as sign on the back of the Cell-Checker. On the Top of the Cell-Checker you will find the button to set the alarm voltage. Press once will show the actual setting. Press again less then one second after will increase the alarm voltage. The voltage is shown for one cell.
you can set the point alarm , with press the booton , and set it alarm from 2.7 volts /cell - 3.8volt /cell or disable alarm with press the button on top , until appears "OFF" , it very easy to use and prevent lipos from damages when over discharge
No problem. I have one of these and was going to order another one for my son who is just getting into the hobby.These things are great. Can't be without it if you care about your batteries. Buy two and give one to your friends.
Can this device be used while discharging the battery, to monitor individual cells? Does the alarm sound when the voltage is below the setpoint, but then reset itself if the load is removed and the voltage rises?
This device basically monitor the voltage of individual cell of the battery continuaously, it will sound the alarm if voltage falls below the set point amd reset when the voltage rises above the setpoint. So yes to your question.
How can I use this to alarm me when my 12v deep cycle battery falls below 11.5V? I think I will need some 3s balance plugs and wire them in series and set the alarm to 3.83v per cell. Would be nice to monitor 1s alarm set at 10.5 - 11.5 v
I'm not sure but I think that would work. I'm not sure that you could stop the display from cycling through it's normal routine though, you'd have to look and wait for it to get to what it thinks is cell three and/or "ALL'. You (might) even be able to set it to alarm at 11.4 volts by setting it to the 3.8 per cell. That's all theoretical because I haven't got mine yet but being as cheap as they are it's definately worth getting one and trying it.
I think your right way is to put 3 equal resistors in series, to build a "4 cells like" Lipo, and then monitor that each "cell" goes under a threshold of 2,9V x 4 = 11,6 Volts (or 2,8 - 11,2V) ... should do the job OK !!
WELL,- EUROPEAN BRAINS, GRINGO BRAINS, CHINESE BRAINS AND WOMEN'S BRAINS ALL WORK IN A DIFFERENT MANNOR: EVEN IN TIMES OF COMPUTERS, CAN'T UNDERSTAND, WHY HOBBY KING LETS RUN OUT OF STOCK CERTAIN ITEMS, WITHOUT REORDERING IN TIME! MUST BE SOMETHING WRONG HERE WITH THE CHINESE BRAIN.... BUT SOUTHAMERCIA, WHERE I LIVE IS NOT THAT FAR FROM CHINESE BRAIN CULTURE* ONCE UPON A TIME THERE WAS A “*GRINGO”*, WALKING ON THE BEACHES OF CARTAGENA, AND HE FOUND A BOTTLE ON THE BEACH, PULLED THE CORCH OUT, AND A GENNIE CAME OUT: “*...OH MY DEAR LORD*- GRINGO* THANKS FOR LETTING ME OUT OF THE BOTTLE, I WAS LOCKED IN FOR THREE THOUSAND YEARS...!”* YOU HAVE 3 WISHED FREE NOW! THE GRINGO SAID: “*I WOULD LIKE TO SEE SAN ANDRÉ*S, BUT I'M AFRAID OF FLYING AND I AM AFRAID OF SHIPS AND WATER TOO,- WHY DON'T YOU JUST BUILD ME A HIGHWAY TO THE ISLAND, AS WE DID WITH BAHRAIN?..”* GENNIE NODDED, AND FINALLY SAID: GRINGO,- THIS IS IMPOSSIBLE, THIS ARE 420NM OVER 4000M OF WATER!, PLS MAKE ANOTHER WISH! OK, GENNIE,- CAN YOU TELL ME, HOW A WOMEN'S BRAIN WORKS ?
GENNIE:- GRINGO, HOW DO YOU WANT YOuR HIGHWAY TO SAN ANDRES? 2-LANE OR 4-LANE?
^^ I`m very impressed o_O
yes it could be the HK gathers her supplies in its global warehouses until enough items on the list and so quite expensive transportation is worthwhile - that keeps the costs down for the end product. I also think that at such low prices as HK offers some customers order it and so more of the same item on the mass of customers a quick article. out of stock. can be.
.made with translator. sorry my English is very bad so i need translator.
Well at least one item is back in stock with a few extras for other buyers ....... but i CAN'T order one item and the other 6 on backorder ...... where are the extra motors and speedies ?? NONE in stock 11 minutes after getting an email ther were in stock ... NOT !!!
A Most Excelent product. For $4.00 u can extend the life of ur lipos enormously. I have 4 ZIPPY Compact 1600mAh 4S 35C Lipo Pack and after 20 cycles or so each, none of them have ever fallen below 3.7v per cell i set this for 3.8v and land immediatly upon hearing the peizo beepers u can even hear it over the top of my 64mm stingers EDF .. and on my epp 3d plane u can hear it 100m away.. If ur annoyed by ditching a lipo because one cell drops volts faster than the others. Or u buy quality Lipos then this will be the best $4.00 u will ever spend
I bought 3 of these, to monitor my Zippy LiFePo4 battery voltages (3s3p, 3x1800mAh) in my Slash 4x4 and let me know when I'm drawing too much power.
Luckily 3, because I already lost one in a big crash by not securing it properly. Only noticed it missing after some while. But it wasn't bad, because I still had a few to spare and could put another one in order right away.
Tip: Use velcro tape to secure it to your car, and put some electrical tape on the openings to keep the moisture out.
Unfortunately, my battery has another connection type...
It would be great to see a balance cables on this site as well.
If anybody knows where to by the balance 8S plugs/connectors then please let me know.
I plan to use these, with some jxt parallel boards to make an electric bike battery pack. I'll turn them off when not in use, but I've heard of people having trouble with the low voltage alarms actually unbalancing a pack due to unequal draw on different cells. Should be easy to check with some jumpers, I went ahead and ordered a few.
The motor controller is only 25A and I'll be running 10AH of 20C lipo, so I certainly hope the voltage doesn't sag that much. I already ran this pack on a different bike once and the voltage didn't sag much at all actually, maybe 0.25V/cell average.
I am curious why you are asking this. The current will be minimal. A few mA at most! I did not open the box but normal electronic desighn will pull the the primary current form one cell. This simplifies design and makes the defice cheaper. I gues this will be from the firste cell because you must be able to measure small batteries. :-) So during a run this will have no impact but neaver leave your batteries attached to the device when you store them!
Alarms should face down towards ground so that they are easier to hear. I have it mounted on the outside & if alarms face down you can't read the display as it is wrong way uphttp://www.hobbyking.com/hobbyking/store/images/em _rolleyes.gif
It is loud anough if the car is not miles away. In most cases you will have anough time to shut down the car with an empty battery. If you have any doubt you can also set the Low Voltage Alarm 0.1V higher which will give you some more time to hear the alarm. :-)
There's no need for a manual. It only has one button which scrolls through the different alarm levels. I suggest you set it to something like 3.3v if you use it on a multi-rotor and if you use 3-4S, that'll give you roughly one minute to land before the ESCs cut the power. The pins should be labeled, so you can't hook it up wrong.
as soon you connected to a balance plug and it is on you will hear a lowd beep ,means that it works..after that locate on top between the two round alarms a tiny button .every time you press it will go like 3.7 or 3.6 or 3.5..etc.i always set it to 3.6..just in case other plane is landing first than me and i have to go around
I have not purchased this from HobbyKing but rather from another site. Nonetheless, this is by far the best low-batt alarm out there. Four factors make it so great:
1) being generic to any number of cells (2,3,4...8)
2) the buzzer is LOUD :) you can actually hear it when the plane is in the air from almost any distance
3) the alarm threshold is programmable and extremely simple to change
4) it monitors each of the cells individually rather than total battery voltage
8 comments. Reply..
Top " LiPo Telemetrie für Arme ". Ich nutze dieses Teil um die max. Flugzeit meiner LiPo's zu ermitteln. Einfach als Signalschwelle 3.4V programmieren und dann fliegen. Sobald eine Zelle diesen Wert erreicht hat faengt das Teil an zu piepsen. Und schon weiss man dass man landen sollte. Ganz einfach und effizient.
No comments. Reply..
Don't think, just buy.
Seriously good deal. Great price too compared to the famous chinese dropship sites :P
No comments. Reply..
The best beeper I have ever used I have 3 of them. I bought them from ... almost the double price. If you going to buy a beeper this one is a must.
Loud clear sound
Adjustable alarm voltage
Individual cell count
4 comments. Reply..
Petit gadget très utile et pas cher, il mesure la tension de chaque élément de la lipo et sonne trés fort lorsque un des éléments descends en dessous de la valeur de sécurité programmable entre 2.8v et 3.8v. A laisser sur le modèle branché sur la prise d'équilibrage de la lipo pendant le vol et sonne lorsqu'il est temps de se poser. Il évite ainsi que les éléments individuellement de descendent en dessous de leur seuil de sécurité durant le vol. Un bon complément au BEC des contrôleurs qui lui ne mesure que la tension totale mais pas la tension individuelle. Pour prix, ne pas se priver, il peut sauver des lipos dont un élément est un peu plus faible. Personnellement, je règle le seuil à 3.4V par sécurité. Ne fonctionne bien sur qu'avec les lipos de 2s à 8s.