Questions tagged [nimh]

A nickel–metal hydride battery (NiMH) battery is a type of rechargeable battery. They have a better energy density than nickel–cadmium batteries (NiCd or NiCad) and have largely replaced them in many applications.

22 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
843 views

How to protect single cell Ni-MH battery (overcurrent, undervoltage, overtemperature, etc.) during discharge?

Story I am designing a boost converter for a battery powered board. I am planning to use single Ni-MH battery. The needed output voltage is 3V3. The device will be in deep sleep mode (drawing few ...
2
votes
2answers
151 views

Trickle charging 10NiMh in series with ~1W solar panel

I have been put onto a project that needs to be powered by a small (1-2W) solar panel trickle charging a battery pack. The product will be located on rooftops. We have reviewed similar products and ...
2
votes
0answers
817 views

NI-MH battery charger using MAX712

I don't belong to electrical engineering but I am trying to develop a intelligent Ni-Mh battery charger for one of my project. I am using MAX712 battery charging management IC. Reason behind that is: ...
1
vote
0answers
35 views

Repair/Rebuild NiMh battery pack?

2 years ago, bought a name brand cordless VSR drill motor with a 12 V battery pack for only $20. (I realize now, it was on clearance, as Manufacturer moved to a line of 20 V interchangeables...so it ...
1
vote
0answers
165 views

Any deleterious effect from very strong, close magnets on NiMH cells over time?

This question probably isn't a perfect fit for this SE, but I did find this question: Will placing a strong magnet near my electric skateboard Li-Ion Battery pack damage or discharge it? This is a ...
0
votes
0answers
44 views

USB-C breakout board, using V and G with a NiMH charger am I doing this wrong?

I’m pretty new to electronics so trying to find my way around. I’ve purchased this breakout USB-C: https://www.amazon.co.uk/Chenyang-24pin-Female-Socket-Connector/dp/B00VJ944V2 And this NiMH battery ...
0
votes
2answers
95 views

Rechargable batteries

The diagram is from a wall mounted vacuum cleaner. What can the green thing be and what could its price be so i can replace it? Can i use 7 x AA NiMh batteries with 4800mAh each at 1.2 V ? Can i redo ...
0
votes
0answers
32 views

Solar charging “12” volt nimh battery pack

So, I have 3 parallel 8-battery packs of nimh batteries wired in series - a total of 24 AA batteries. One battery is 1300 mah so I assume this should give me a total of 3900 mah. This gives me 9.6 ...
0
votes
0answers
17 views

Power backup for NiMH battery

I have a device powered by a 5S NiMH battery. The device sounds a low voltage alarm at 6.6v. When fully charged, the NiMH reads around 7v or higher. I have a few small boost converters. Could I hook ...
0
votes
0answers
96 views

NiMH battery discharged to 0V

I have a 90's handheld CB that I'm powering using 10x1.2V NiMH cells all in series. Because these cells are rather old (at least 8 years), when I got a low voltage warning, I decided to measure all ...
0
votes
0answers
31 views

Convert Ni-Mh charger's connector from cigarette lighter to USB

I recently purchased a very basic airpump to inflate a mattress. As we will be taking this mattress to a camping trip on a motorbike, we wont have a car cig-ligther socket (12V), only USB 5V. This is ...
0
votes
1answer
107 views

NiMH battery pack charging circuit using Solar panel [Help]

Recently I have been working on a NiMH battery pack (7.2V / 2100mAh) charging circuit powered by a 12V solar panel. With some research I found charging NiMH takes different forms by measuring change ...
0
votes
0answers
83 views

Replacing Nimh battery to Li-ion in hybrid cars

is it a good idea to replace a Nimh battery in hybrid car (like prius model 2012) to Li-ion battery without any problems.
0
votes
0answers
31 views

Overvolting brushed motors by 0.2V

For RC models, I own several brushed motors which are intended to operate at 7,2V. According to my previous tests, they usually take 25 amps, 30 being the absolute maximum. To divide by two the weight ...
0
votes
1answer
55 views

Can I change laptop's RTC and backup battery with generic Ni-MH?

I got old laptop for a good price. After some inspection, I noticed that backup battery and RTC battery are already gone bad, and seems can't hold charge. I've checked eBay for replacements, but only ...
0
votes
0answers
62 views

Power Jack part number for YAESU FT 23R battery pack?

I am planning to design a small USB powered charger for the battery pack used with the radio YAESU FT 23R. I have been searching for the correct name / part number of the power jack connector shown in ...
0
votes
0answers
97 views

Vacuum cleaner charging works only with the original adapter - why?

I have this old robotic vacuum cleaner that I got cheap and was using for a while: https://www.youtube.com/watch?v=nvj8BmijDn4 (not my video) Now however the charging adapter broke and I've been ...
0
votes
0answers
499 views

Do NiMH demand balancing?

Is it fine to charge a pile of 8 2 Ah AA NiMH @ 11.6 V 0.5 A serially? They are from the same packaging and were bought only for use as an 8x pack - they were not used for anything else. Im not sure ...
0
votes
1answer
76 views

Safe to replace just some cells in a NiMH battery pack?

The battery pack of my Roomba is made of 12 sub-C NiMH 1.2v cells; two of them are down to around 0.5v, and the Roomba won't work. Can I replace just these two cells with brand-new ones? Will this be ...
0
votes
1answer
49 views

Protect device from losing power when to much current is drawn

I use an EVX 3014 RC ESC (BEC provides 5V & 1.5amps) and I'm worried that to much of the current will be drawn to the motors that not enough of it will be available to the raspberry pi computer (...
0
votes
1answer
3k views

NiMH battery voltage drop under load

I have a 8.4V, 5000mAh NiMH hump pack running 2 PC cooling fans, each of which draws ~5A. When I turned on the system (battery voltage ~9V), the fans ran fine for a moment, but then the voltage ...
-1
votes
1answer
54 views

Charging or replacing old battery pack without burning house down

A wealthy neighbor passed down the most awesome toy ever for us to give our son under the Christmas tree, but it's got no charger. And I have no idea if the battery pack inside works. That pack is ...