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Resolved Resolved by Nomad 6R!

Battery Charger

My battery charger is not charging and the green light is always on? I have been able to charge a few times now without issue and this happened just yesterday. Cannot charge my robot now....

Is there anything I can check/do to get this working again?

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Synthiam
PRO
Belgium
#23  
rich

well i disagree,
using a faulty charger can ruine your batt too.
the learn section tells you how the charger works,red&green led.
and averyone is asumed to read the hole topic.
United Kingdom
#24  
We haven't determined that the charger is not charging though, all we know is the green LED remains on all the time.

We also haven't determined if the battery itself has become damaged. A new balance charger for a battery that has been damaged due to under voltage (possibly through the use of a faulty charger) will not solve the issue either.

The whole topic doesn't give this information. Diagnostics is incomplete.
#25  
here is a pic showing voltage from the terminals on the charger as requested. also a pic of the battery terminals tested. the battery is showing >8v; does that mean it is charged? i know the robot complains when the voltage drops below 6.6v.

when i discovered the issue, it charged for at least 4 hours. i am worried that the charger will not shut off and possibly ruin the battery (or catch fire) if the charger is faulty.


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PRO
Belgium
#26  
rich

you have a point there not knowing iff its the batt or the charger.
aldo the green led chouldn lid up when there's no batt connected.
i do have some info about a bad batt.you can see on a charger iff the,
batt is bad.the led on a charger goes out or blink red.
so i gess we bolt earn 1.5 credit


all your robots

good find and good reason to by new one.
#27  
Looks to me that your charger is actually charging or at least outputting... Your battery is pretty much fully charged, by the way...
United Kingdom
#28  
Balance charger voltage is correct and therefore will charge the battery.
Battery voltage is OK, it's not fully charged (8.4v) but it's close. Which is good news.

You should never leave a LiPo battery unattended while it is charging.
The balance charger charges at 1A, divide the battery capacity by the charge rate to find the time required to charge it. A 1600mAH battery charged at 1A would take 1.6 hours to charge.

I'm not sure, but believe that you cannot overcharge a LiPo since the charge voltage is the same as the battery voltage when fully charged. The voltage of the battery therefore cannot increase above the charge voltage. However, as I said I am not 100% sure of this. I will need to look it up (unless someone else chimes in). In the mean time, do timed charges based on the above calculation, check the voltage of the battery when you take it off charge and check it's 8.2-8.4v
#29  
okay, since the battery has been charged, does that mean that the charger is still charging it and that it won't overcharge the battery?

i don't know enough about electronics other than putting a voltage meter on batteries to see if they have a charge.

i am worried that it will ruin my battery or worse, cause a fire.
#30  
@Rich, sorry, didn't see your post until after I posted. I will try your recommendation.

Just to be clear, I should read 8.4v on a fully charged battery and that it should take ~1.6 hours to fully charge the battery. Is that from 0v on the battery or from the 6.6v?

Can I use the charging connector on the bottom of the robot to check the voltage or do I have to pull it out each time?
United Kingdom
#31  
No no no no no. Never 0v on the battery! Never below 6v on the battery!

From around 6.6v however my example above is for a 1600mah battery. EZ-Robot batteries are 1300mAh. It will take about 1 hour 20 minutes to charge (give or take).

Yes you can measure the voltage on the connector. On the connector it's the outside 2 pins for total voltage.


One thing I just remembered though, on first charging Six with the EZ-Robot charger my green light never turned off. Turning the robot on while it was charging fixed this, it's been working fine since. No idea why, not really recommended but shouldn't do any damage if it's only powering it up then turning it off after a few seconds.
#32  
Is it possible that this indication occurs if the charger circuitry has detected operating temperatures inside the charger enclosure that are above factory specified levels?

Bob J
#33  
@bobjacon, don't think so. this happens when the charger has not been charging for hours and is cool to the touch.
Canada
#34  
Will that create any issue if I let the charger connected to the batteries when I am using the EZB and servos.

I am presently developing and testing scripts for my Inmoov robot.
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#35  
You dont want to leave the charger plugged in when using the battery.
Canada
#36  
Tanks Dave,
What could append?
#37  
Worst case, blow up the battery. it could also fry the the electronics in the battery causing a surge to power to go to the ez-B.
Canada
#38  
Tanks for the advice!

I gess I could make a circuit to automaticly isolate the EZB when it sense a low batterie condition and let the charger do his job, and after bring back the EZB back on line.

Do you have any other sugestion?
#39  
The issue is that lipo's dont like being full. It would be safe to do this when the battery is at about 3.9v per cell and cut off when at about 4.05v per cell.
#40  
A better option would be to get a variable power supply that supplies the needed amps (min of about 20A). This would let you adjust the voltage to what you need and allow you to work on things without needing the battery plugged up. To make a full Inmoov function I would look at a 50A supply but, until you get to that point, the 20A will be fine.
Canada
#41  
Tanks Dave I'll be looking for it
#42  
Well since I'm in a chatty mood and I think I soaked this thread in, I purchased the lipo and charger from EZ-Robot a few months ago and since day one the charger has always had the green indicator light on irregardless if a battery is plugged in or not. The charger is putting out 8.6 v and the lipo is at 8.6v. I just leave it run over night. Poor quality control. Maybe things have gotten better from China for EZ-Robot now.

I live with it because it is working for the time being and why go through the hassle of return shipping charges and then the wait for another drop shipment from China? No thanks


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