How fast can you charge NiCD and NiMH batteries

Started by anwar, September 03, 2009, 12:07:52 PM

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sushil_anand

Quote from: Sahevaan on July 15, 2010, 08:59:00 PM
It was a chinese battery 6v 700mAh and the charger came with it (It was from a nitro buggy)

There you go! Obviously not intended  for 0.1C charge! I am sure there would have been NO specs with the charger. How have you assumed/deduced it's charging rate?
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rameshtahlan

never forget the golden rule, if it is not printed fast charge, u r only to charge at 1/10 of the capacity, and if they r designed for fast charge, the fast charge rate will be printed, so just follow the convention, and u will never go wrong.
Ramesh.

iamahuman

oh thanks vinay, that was exactly what I was thinking of.An alarm.Just one more question.Do the batteries get damaged after one 'bad' charge cycle?say, overcharging?
"Chuck Norris once overcharged a lipo. Thank him for the Sun."

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vinay

#28
No. But they reduce the charge cycles and slightly reduce the capacity each time you BAD charge them. But if you BAD charge them way too much, then its a goner.

EDIT: AFAIK overcharging NIMH will reduce the Cycles greatly.

xxkrishxx

I've checked the Turnigy accucel chargers in HK site,they have mentioned the charger input voltage as 11-18 v tat means can't we connect tat in our normal home electric plug? And also mentioned as power supply not included..
BalaKrishnan
Mechanical engineer..

Radio:Spektrum Dx6i | Futaba 6EXP | working on coro Avispad | HK450MT kit | Seagull Boomerang 40 | HK 250GT | Upcoming: Easy Star 2 |

vinay

You cant, U need a minimum 5 Amps power supply at 12 V or Use a UPS battery if u have.

rameshtahlan

Krish,
this is obviously a DC charger, and why they say power supply not included, is cause, u do get seperate power supplies, which let u plug ur DC charger into the wall outlet. Now AC/DC chargers are available. and the AC part in placed inside the charger. So u could have a DC charger, and take it to the field plug it to ur car battery, and when u at home, just plug in the power supply and use the wall outlet.
Ramesh

vinay

#32
Ramesh, I had a Thunder AC6 Charger and the AC to DC switched supply was bad out of the box. It was spitting out 106 V AC instead of 12 V DC. I used to get shock when I used to touch the charger. The earthing part of the built in supply was good, but the switched supply was bad. Thank god Lipos didnt explode. Now I use a computer power supply to power the AC6 charger.

My Bad Luck with it  >:(

Could not send it back to NitroPlanes.com as shipping back would become expensive.

sushil_anand

With 106V coming out of the supply, it would be the charger that would blow up first. How did you discover this?
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vinay

#34
Digital voltmeter. Touching the charger body or the pin outputs was giving me slight juice. Then I opened the charger removed the smps and measured it independently and it still showed the same  >:(

Sorry it was around 86 V. Here is the thread for the same

http://www.wattflyer.com/forums/showthread.php?t=52223

http://www.rcgroups.com/forums/showthread.php?t=1157627

xxkrishxx

So the power supply is an AC to DC converter?
BalaKrishnan
Mechanical engineer..

Radio:Spektrum Dx6i | Futaba 6EXP | working on coro Avispad | HK450MT kit | Seagull Boomerang 40 | HK 250GT | Upcoming: Easy Star 2 |

anwar

Yep, it is same/similar to the one used in many laptops (for the 5A ones).

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6256 (as a sample)
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xxkrishxx

Then can I use my Dell laptop's power supply with the turnigy accucell charger?
BalaKrishnan
Mechanical engineer..

Radio:Spektrum Dx6i | Futaba 6EXP | working on coro Avispad | HK450MT kit | Seagull Boomerang 40 | HK 250GT | Upcoming: Easy Star 2 |

anwar

You have to check the ratings... output 12V at around 5A.  If that is satisfied (most/many do), you can just add the right connector and use it.
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flying doc

I have a printer (670C) adapter which says output = 30 V  400 mA  12 VA
Any idea what this means and can this be be used with the  Turnigy accucel charger http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11444&Product_Name=Turnigy__A-6-10_200W_Balance_charger_&_discharger
doc
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anwar

Looks like NO.  The rated input voltage for that charger is 12V to 18V, and the adapter output seems to be 30V, which i way over the range.
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flying doc

Tiger Sports 40, SPA3D, SPAD Extra all with ASP 52 engines.
SPAD Debonair with OS 46
Turbo Raven 60 with an ASP 91
Next build - Accipiter 91 with DLE 20
Futaba 6EXAP, Futaba 10 CAP

vinay

Quote from: flying doc on July 17, 2010, 12:06:34 AM
I have a printer (670C) adapter which says output = 30 V  400 mA  12 VA

YOu need atleast 5 Amps for a 50 watts charger. here it says only .4 Amps which is way way less. I dont understand why they again mention 12VA  :headscratch:

anwar

That is just the product of volts and amps  30V x 0.4A = 12VA.  For DC, that is the same as wattage, right ? So they wanted to specify wattage/power also ?
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vinay

No, that cant be true. 12VA means 12 V at 1 Amps and cannot be 30V at 400 mah. Both are different. They may be of same wattage, but whats the meaning is specifying it in terms of wrong voltage.

anwar

I don't see the point about "wrong voltage" :headscratch:

http://whatis.techtarget.com/definition/0,,sid9_gci539345,00.html  (quick search result to refresh my memory)

VA is just the product of current and voltage, that's it ??!?!?
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vinay