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.

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74 views

Charger for my own created battery pack

I am building an RC airplane, for which I have also created a battery pack. What kind of charger do I need to power up the simple line-up of: 6 x AAA, 1.2v, 800mah per battery. (Everything is lined up ...
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5k views

Is it possible and safe to freeze rechargeable NiMH batteries to revive them?

I have a couple of rechargeable AA NiMH batteries that I can no longer charge. After the charger claims the batteries have been charged fully they still output 0 Volt. I found some posts that claim ...
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443 views

NiMH or Li-ion trickle charge?

To start off, I am aware that neither battery type should be “trickle charged”. That being said, I have a product that really needs to randomly “trickle” charge a rechargeable battery. I have a ...
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948 views

Avoid voltage drop on DC motor start-up with h-bridge

I'm trying to control a 12V DC brushed motor (4A with load ) with an H-bridge , TLE5205 datasheet ( 5A , 6A peak , 40V , integrated free-Wheeling diodes ), but when using a 3S1P lipo battery ( 11.1V , ...
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78 views

Circuit Design for Managed Draining of NiMH Cells

One of my pet peeves is the prevalence of devices powered by odd numbers of standard batteries (AA, AAA). Since I try to avoid using disposable cells and all of the chargers that I've so far owned ...
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1k views

Materials required to convert NiMH rechargeable 24V/6Ah circuit (20 C-cell) to Li-Ion rechargeable circuit

Below is a picture of a battery shell for a NiMH circuit for a power assist wheelchair battery. I'm taking a guess that each of the 20 batteries is 1.2V because the entire circuit is 24V. These are ...
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67 views

NiMH 1.2V 1/3 AA 280 mAh is it possible the claim made for size and capacity?

I am browsing some batteries to use for a wearable project.Initially I wanted to go with Lipos but upon stumbling upon this link I am amazed at NiMH and the variety of size, shape and battery capacity....
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3k views

Solar Cell - Preventing overcharge of an NiMH battery

I am trying to design a circuit and was wondering how to design it that the 12V 800mAH NimH battery I am using will not overcharge. I have researched trickle charging and as far as I understand, a ...
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1k views

charging circuit for series coin batteries

I am designing a circuit that will be powered by two rechargable coin cells in series, and I need to include a module to recharge them in-situ. I have had a look on RS at the range of rechargable ...
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3answers
1k views

Switching between two sources of power to a battery?

This is the simplified system: a battery (3.6 V, 2450 mAH, NiMH) a solar panel (max 5.2 V, 157 mA) a wall charger (5 V, 2100 mA). The battery is constantly being drained, but very slowly (85 mWh per ...
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4k views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
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1k views

IC for Trickle Charging vs. Fast Charging a NiMH rechargeable battery using solar and wall charger?

I want to use a solar panel to extend the use time of 3 NiMH AA's in series to power a microcontroller. The solar panel is rated at 1 W with a max load voltage of 6.4 V and the product page is here. ...
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2k views

NiMH battery for Electric Bike

I've come into an electric bike that currently has a NiMH, 24v, 20cell battery pack. On the pack as well it says 8000mah. The previuos owner has misplaced the original charger :( The bike has been ...
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499 views

Instantly Hot Transistor

I have a TIP42G PNP transistor, and when I used it, it instantly smoked. Would it be because I shorted the base directly to ground? (through a button for the initial turn on, and through a 2n2222 for ...
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1k views

Powering GSM Module from 2 x AA NiMH or 3 x AA alkaline batteries

I'm trying to power a GSM modem from 2 AA NiMH batteries in series, and wonder what my options are. Main consideration is that it needs to be USB rechargeable, so I only have 2 batteries to work with. ...
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320 views

How does battery charging work

I want to charge a 7.2V-2000mAh NiMH battery. I have many solar panels and a voltage regulator but I do not know what voltage is required to charge it. I've heard people say that as long as it is any ...
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7k views

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 ...
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2k views

Do AA battery chargers detect battery charge level and automatically turn off when full? [closed]

When I put in AA batteries for charging, do I have to remember to disconnect the charger after the specified number of hours, or does the charger detect the charge level and automatically turn off ...
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3answers
980 views

How can I make a safe Ni-MH charging station?

I wanted to make a docking station for my robot. My idea was simple - robot drives in, batteries are disconnected, pins that I attach to my Ni-MH charger's electrodes are inserted into battery pack, ...
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1answer
422 views

What is a good NiMH charger? [closed]

I have some (cheap/old?) batteries that I need charged. The problem is, the chargers I have keep charging them until they get overcharged and lose their capacity. I already ruined 4 1800mAh-...
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2k views

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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2k views

How to calculate time for NiMH batteries to discharge?

I want to use 4 battery cells AA NiMH (or NiCd) 1.2 V, 2600 mAh in order to power up circuit that requires 5 V, 300 mA. I know that fully charged NiMH can provide 1.35 V each, which means 5.4 V in ...
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194 views

ICSwitching between solar panel and batteries

I would like to charge the NiMH batteries, when there is excess power from the solar power and use the power stored in the batteries, when I need it (to drive a motor and at night). I have the ...
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2answers
621 views

How to power up BeagleBoard-xM using batteries?

I 'm looking for a battery solution to power up BeagleBoard-xM. Until now, I used a 5 V, 3.2 A AC/DC power supply adapter (2.1 mm barrel plug). I 'm thinking of using a 4 x 1.2 NiMH AA battery pack (...
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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: ...
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3answers
327 views

Sanyo battery: what 430MH stands for?

I have a SANYO NI-MH battery from my Oral-B toothbrush. I reads 430MH. Now I'm curious what does 430MH stand for? Im thinking its probably nickel–metal hydride if ...
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2answers
4k views

NiMH battery charging by MAX712 IC

I am using MAX712CPE(DIP) version for charging 1.2 volts × 8 batteries. Using the datasheet and available information on the Internet, we made the circuit schematic and are about to implement it....
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3k views

Step up DC-DC converter for powering Raspberry Pi from batteries

I will power a Raspberry PI with 4 NIMH batteries, but they quickly lose charge, and end up at 3V instead of the 5V needed. I was wondering about a DC-DC step up converter. I want a converter that ...
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1answer
1k views

Electric toothbrush charging time [closed]

I replaced my old Ni-Cd 1.2 volt sub-c battery (1500 mah) from my electric toothbrush to a new Ni-MH battery 1.2 volt sub-c (3800 mah). I looked inside the toothbrush and it look like there is no ...
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4k views

How to use Battery Charge controller (BQ2002N)

I am working with an Arduino which I have a 12v power supply for, but also needs to be able to run off a NiMH/NiCAD battery pack when not connected, and recharge the battery pack when it is connected. ...
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623 views

Get 12v power from NiMH battery

I have an Arduino project that is powered from 12v/15A dc power source needs to switch to battery power and still get 12v (dc power may start/stop at any time) recharge the battery when dc power ...
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81k views

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 ...
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1answer
783 views

Should my NiMH battery powered circuit/device switch power sources when charging?

Details Battery Supply: 2.4V (2x NiMH 1.2V - 1500mAh batteries ) Charging Supply: 5V (USB Power Adapter / Wall Wart) Switching Regulator/Controller: NCP1450A 3.3V Step-Up Boost Supply Voltage ...
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1answer
2k views

3.6V NiMH smart charger, microcontroller, auto switch over from DC in to battery

I'm working on an agricultural pump monitor project using a microcontroller. It needs to be able to operate ~1 hour after power failure, and signal same. I'm hoping there are maybe single chip, or ...
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13k views

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 ...
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2answers
212 views

Battery charger for AA batteries

I am looking for a battery charger for AA batteries, without taking out the batteries from the board. The board which is powered by AA batteries is : http://www.tagsense.com/images/stories/products/...
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3answers
2k views

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), ...
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562 views

powering android phone from 3 AA battery directly (not USB!) [closed]

I have Sony Arc phone which was spoiled by me (story OutTopic) as it won't charge lion battery anymore. the phone itself works perfectly. I don't want to do the regular 3AA to USB charger way. Trying ...
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3answers
7k views

Alternative recharging methods for a toy car [closed]

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 ...
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5answers
336 views

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 ...
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1answer
3k views

How high charging temperature causes damage to AA size NiMH cell

I used a portable thermometer and put on top of a battery charger. I notice that the temperature reach 39 degree Celsius and I can feel the warmth when I put my hand on top of the charger & the ...
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2answers
2k views

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 ...
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1answer
493 views

LSD NiMH cells that provide reasonable capacity even in subfreezing temperatures

Sanyo claims that 2000 mAh Eneloop LSD AA NiMH batteries provide about 1400 mAh at -10 °C (-15 °F). I wonder if only Eneloops provide reasonable capacity in the cold, or if the competition does too. ...
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4k views

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 ...
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104k views

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 ...

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