Adding Nicad Battery pack to 5v circuit that is constantly charging

simonbramble · Jun 29, 2021

audioguru said:
No. The capacity of a Ni-MH cell is much higher than a Ni-Cad.

Sorry - you are right. The peak current of a NiCad is much higher, but its capacity is considerably lower. Sorry - it has been 20 years since I last designed with Nickel chemistries

Nigel Goodwin · Jun 29, 2021

audioguru said:
Do any stores sell antique Ni-Cad batteries anymore? Even very cheap solar garden lights use Ni-MH cells that are sold everywhere now.
Duracell and Energizer in North America have not made Ni-Cads for many years.
Google says that the EU has banned Ni-Cad batteries because they produce toxic waste.

As in every other thread you post this rubbish, NiCd are still freely available - and previously I even listed how many types RS Components actually currently stock.

NiCd have higher power capability than NiMh, which was why they continued to be used in cordless tools.

NiMh are also not any more reliable than NiCd, we change hundreds at work (all using specialised charging circuits) - but don't see any NiCd's (other than older cordless tools).

simonbramble · Jun 29, 2021

My problem is that there are too many NOOBS here.

That is a narrow minded and self serving attitude. Not everybody's first language is analogue electronics. Most kids these days are experts at digital and the analogue side takes a bit of getting used to. People should feel free to post questions in a respectful way and get a respectful answers, from those more experienced than them. Answers like yours are not helping and comments like

I come here to talk to my peers about new and improving circuits, not about the basics.

are not moving the industry forward

Visitor is right. Noobs come here to get wisdom from those more experienced, not to be insulted by dusty old men slapping each other on the back with their own pomposity.

Tony Stewart · Jun 29, 2021

Buk said:
Hm. So, it would be okay to import NiCds from Yausa or Panasonic in Japan?
How about NX(enix) in the UK?
Or Varta in Germany
Or ArtsEnergy(Saft) in France; and Sunnyvale California?

Interesting…

Under the so-called "batteries directive" (2006/66/EC), the sale of consumer Ni–Cd batteries has now been banned within the European Union except for medical use; alarm systems; emergency lighting; and portable power tools.

This last category has been banned effective 2016.[12] Under the same EU directive, used industrial Ni–Cd batteries must be collected by their producers in order to be recycled in dedicated facilities.

Tony Stewart · Jun 30, 2021

kimbear said:
Ok, so I am looking to make something portable, that was originally designed to be desk top locked. It has a 12v Wall-Wart power supply, and the circuit runs off of a 5vdc and a 3v dc regulator. Its actual running current is quite low, on both voltages, So I would like to free it up, and add NiCads that constantly charge whenever the Wall Wart is plugged in, and also runs off the Wall Wart. Anyone have a nice simple schematic for me to do this.
(Ps I know that this is a clumsy explanation, but bear with me, Im not very bright)
Thank you in advance

Either a smart charger or a not so smart trickle charger at the float voltage of a non NiCad battery with low memory effects would be ok.

Tony Stewart · Jun 30, 2021

Nigel Goodwin said:
As in every other thread you post this rubbish, NiCd are still freely available - and previously I even listed how many types RS Components actually currently stock.

NiCd have higher power capability than NiMh, which was why they continued to be used in cordless tools.

NiMh are also not any more reliable than NiCd, we change hundreds at work (all using specialised charging circuits) - but don't see any NiCd's (other than older cordless tools).

I’m not so sure about the specs you are comparing.. but there are contradictions to what you said. “NiCd have higher power capability than NiMh”

NiMH batteries offer a higher capacity than Nicad batteries, and less capacity than Li-Ion. They are nearly twice as heavy as Nicad batteries. (Yet higher ESR than NiCad)
REF :https://www.batteryuniverse.com/help/battery-chemistries

Nigel Goodwin · Jun 30, 2021

Tony Stewart said:
I’m not so sure about the specs you are comparing.. but there are contradictions to what you said. “NiCd have higher power capability than NiMh”

Quite simple - more power - a NiCd battery pack on a drill will make a more powerful drill than a NiMh one, which is why you didn't often see NiMh in cordless tools. now of course Li-Ion have mostly replaced them both.

Visitor · Jun 30, 2021

Visitor said:
This forum is largely comprised of grumpy old men. Attracting new members is kind of vital to keeping it alive. People asking honest questions should be guided along. Sure, many of the questions posted here can be easily answered by Google....if a person knows what to search for. Sometimes, questions are asked as a reality check. Just because "the perfect solution" shows up in a search doesn't mean it's the best solution for a particular problem, or sadly, it may not be a workable solution at all.

Just in case you have doubts about the need to encourage new members, look at the member/non-member distribution. It's somewhat skewed by the time of day, but the number of visitors always outnumbers the number of members here.

If you've ever been inundated by the ads you see when you're not logged in, you might wonder why more viewers don't sign up to be members.

Pommie · Jul 1, 2021

Visitor said:
Just in case you have doubts about the need to encourage new members, look at the member/non-member distribution. It's somewhat skewed by the time of day, but the number of visitors always outnumbers the number of members here.

If you've ever been inundated by the ads you see when you're not logged in, you might wonder why more viewers don't sign up to be members.

View attachment 132240

Yup, short term gain for long term nothing. Very short sighted. To be fair, most guests are robots. BUT.

Mike.

simonbramble · Jul 1, 2021

I see kimbear's recent comment has just been deleted (check your emails). He makes a good point

Pommie · Jul 1, 2021

simonbramble said:
(check your emails)

Don't get emails from the site.

Mike.

Adding Nicad Battery pack to 5v circuit that is constantly charging

simonbramble

Active Member

Nigel Goodwin

Super Moderator

simonbramble

Active Member

Tony Stewart

Well-Known Member

Tony Stewart

Well-Known Member

Tony Stewart

Well-Known Member

Nigel Goodwin

Super Moderator

Visitor

Well-Known Member

Pommie

Well-Known Member

simonbramble

Active Member

Pommie

Well-Known Member

Similar threads


					This forum is largely comprised of grumpy old men. Attracting new members is kind of vital to keeping it alive. People asking honest questions should be guided along. Sure, many of the questions posted here can be easily answered by Google....if a person knows what to search for. Sometimes, questions are asked as a reality check. Just because "the perfect solution" shows up in a search doesn't mean it's the best solution for a particular problem, or sadly, it may not be a workable solution at all.

Adding Nicad Battery pack to 5v circuit that is constantly charging

Active Member

Super Moderator

Active Member

Well-Known Member

Well-Known Member

Well-Known Member

Super Moderator

Well-Known Member

Well-Known Member

Active Member

Well-Known Member

Similar threads

Privacy & Transparency

Privacy & Transparency