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.
Questions tagged [nimh]
182 questions
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At what voltage is a NiMH battery empty?
I have a battery pack of NiMH batteries. It is ten cells with 1.2V, 4000mAh each, put together in series. So rated voltage is 12V. After charging, i.e. when the charging device says that it is finished, I measure 14.3V.
When I now discharge, at…
Till B
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Why are Alkaline, NiMH, and Li-ion AA measured differently (mAh, mWh, etc)?
Looking around Amazon, it seems that different types of batteries are measured differently:
Does anyone know why?
Li-ion are measured in mWh
1200mWh ALTIZURE (Cheap-Os)
3200mWh Deleepow
3000mWh AmpTorrent
NiMH are measured in mAh
2000mAh…
coolaj86
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Is soldering wires directly on a NiMh battery safe?
I'd like to know if soldering two wires directly on a NiMh battery is considered as safe or not.
My fear is that battery would explode (right in my face) because of excessive heat caused by the soldering iron. Other possibility would be the battery…
tigrou
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LiPo vs. NiMH for kid's toy
I've been researching here and on google regarding potential battery technologies for a toy that I want to make for my kids. I was hoping to get others' perspectives on this, keeping in mind that this is for a child.
I'm trying to look at this from…
Dave
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NiMh or LiPo batteries for unattended charging/usage
I'm in the planning stage of a summer project: A WiFi controlled robot for remotely monitoring a shore home. The robot will consist of a 4-wheel platform (4 motors, 1 A stall current each, 7 V), Raspberry Pi Model A + WiFi dongle, and Raspberry Pi…
Chris Laplante
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Supply three different voltages from the same pack of NiMH rechargeable batteries
I have a battery pack that I would like to use as a source for all of my battery powered components on a commuting bicycle.
My pack includes (10) 1.2V cells wired in series:
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| …
LeftyMaus
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Arduino Runing On && Charging NiMH batteries
I have a project I'm working on that will have an Arduino running on 2 or 4 rechargeable NiMH AA batteries. I say 2 because I might boost up the voltage to what's needed. My problem is that this project will sometimes be plugged in and I would like…
Adam Dally
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Alternative recharging methods for a toy car
Question: I would like to know about alternative recharging methods for a rechargeable toy car.
Synopis
I have the Fisher Price Shake n Go Xtreme car and track set. The cars are problematic in two key areas with regard to the electronics: …
RussellW
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How to place thermistor for reading temperature in NiHM single AA cell charger?
I'm laying out a PCB for a NiMH single AA cell charger following the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries but I'm not sure where to place the NTC thermistor that will read the cell temperature throughout…
Ricardo
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Can I indefinitely "trickle" charge NiMH batteries with a constant current?
[Note: Various answers to other questions address this, but I cannot find
another question focused on just this. This is my attempt to create a
definitive place for answers to this.
[If at all possible, please include references in your answer. If…
cjs
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How fast may I trickle charge a full LSD NiMH battery?
I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer.
Sadly, the datasheets aren't very detailed:
• One datasheet is just a single page long. It says that I should…
unforgettableidSupportsMonica
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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 microamps from the 3V3 output) most of the time.…
ayazar
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Rechargable batteries vs alkaline
The instructions on these two devices (A flashlight and handheld radio) say not to use rechargeable batteries. Will using rechargeable NiMH batteries damage these devices or just cause them to malfunction? Both items sell a version with a…
105
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Algorithm to know NiMH battery level
Background
I have a device with a NiMH battery. This is a portable device, so I need to know how much battery I have left at all times.
To achieve this, I want to map the battery voltage to a percentage between 0% and 100%.
Characteristics
The…
Flame_Phoenix
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Choosing the type of battery for a project
I am working on a machine which consists of 10 servos, and one microcontroller. The servos need to be on pretty much all the time for about 8 minutes. I am planning on using the ATmega16 to provide the signal to the servos. The servos I am using are…
capcom
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