Connecting nimh batteries in series,reconditioned worx battery recall,new car battery but still wont start 60 - 2016 Feature

03.10.2015
There are two different ways of configuring your own battery pack.You can either connect them to maximize your voltage output or you can connect them to maximize the overall capacity of your battery pack. Connecting batteries in series will cause the voltages of each of your batteries to be additive while the capacity will stay the same. Connecting batteries in parallel will cause the capacity of your batteries to be additive while the voltage will stay the same. There are three things to consider when looking at which batteries are the best fit for your project: voltage, capacity, capability, and power density. NiMH batteries are a form of rechargeable batteries that are a great replacement for alkalines or "ni-cads". Lithium Ion and Lithium Polymer batteries are the newest rechargeables and have found their way into almost every piece of new consumer electronics.
SparkFun also has a nice LiPo charger of their own on the market that I can safely say works quite well, SKU PRT-08293.
PowerStream is the only distributor I'm aware of that sells rechargeable Lithium coin cells in common coin cell sizes and also has a charger available.
A DC-DC converter is a circuit that converts a source of direct current (DC) from one voltage to another regulated DC voltage. The reason for mentioning this is that very often you will want to run your digital electronics off batteries and yet it's very rare that a battery pack will supply your typical 5V or 3.3V. Bodhi Labs is the creator of a variety of step-up battery packs that can be purchased through their website and are often in stock at the NYU computer store. Curious how long your Arduino will run off THOSE batteries while also using THAT electronic device?
Forum friends, I will share with you various methods of building high voltage battery packs for Battery radios. I have built packs from standard sized 9V batteries, and from smaller sized 70mAh cels from Varta, as shown in the photos below. I have been able to make a 50V pack with 20 of these, that has the height of two standard 9V cells and could be used to substitute for an Eveready type 415. The following pack follows the same construction method and was built to supply 90V to my Grundig Concert-Boy 57.
The follwoing packs were built into wooden cases to match the styling of this 1920's Silvertone-Trav-ler portable radio. A cautionary note on NiMH and NiCd batteries: These batteries have extraordinarily low internal impedance. My answer to sophisticated charge ballancing of the LTC6802 is to use parallel charge as much as possible to force packs into charge equilibrium.
My charging method on all these packs is to simply apply 1.4V times the number of cells in series.
The 1.4V charging voltage also has the simplicity that all NiMH cells, regardless of size, will eventually taper off to a charging current level below trickle charge.
The various chargers I have built were made from simple linear adjustable regulators, that were set for the intended number of cells. My favorite adjustable regulator these days is the LT3080 single resistor adjustable and parallelable linear regulator. This regulator uses an innovative elegant architecture, and was conceived and designed recently by our reveered LTC Vice President and CTO (Chief Technical Officer), Robert Dobkin (Dobbie among LTC enginneers). I also added a 12V 1A bulb in series with the 5.6 regulator to lower the voltage applied to the regulator when under heavy load. I also added a 6.3V 300mA bulb in series with the wall transformer that drives the charging regulator for the HV packs in the Silvertone-Trav-ler. If you need to see more detail on all the photos I posted above, simply click for a higher resolution version.
The following schematic and photos show the circuit of the general purpose charger I use to charge all the packs described in the first post. The banana jacks at the top take charge from the 8.4V output of the general purpose charger. You need to be careful in not connecting 7cell batteries in parallel with 6cell batteries, when you parallel charge the cells.
I hope you will put a fuse or two in your battery assemblies to protect against accidental fires. Perhaps you can try positive co-efficient resistors, like those used in loud-speaker protection.
I have used light bulbs in series with low voltage packs or power supplies, with a bulb voltage and current rating that simply results in the lightbulb lighting up normally when there is a short.
A reed switch connectes inverter to battery and is activated by 5 layers of wire wound on it.
However I am considering a NiMH pack without inverter and PIC to monitor each cell and disconnect pack before any cell reverse charges. If something is used a lot and heavy current draw then the NiMH only stack is best capacity and value. The sockets are made from cut up coffee tin solderd to blank PCB scored and isolation lands lifed with knife.
Cut up margarine tub, coffee can tin plate for + common of all six stacks, 6 x coffee tin strips and 6 x 1N4148 diodes on the -V end (to right of photo) and final top B126 socket made of curled and cut coffee tin on plain PCB.
Glue, solder, scissors, thin card, coffee tin, margarine tub, plain single sided paxolin PCB. 1) As the voltage is higher (more cells) it gets harder to ensure that on discharge one cell isn't getting destroyed by reverse charging. Joe Sousa shows the arrangement to switch from series to parallel to charge on an earlier post. This shows that while NiMH are poor choice for HT due to discharge limit issues and charging difficulty they are excellent for LT. NiMH is about 80% capacity of Alkaline at medium current draw but up to x4 life at very high currents.


Just to clarify an earlier ambiguous comment, the  Lithium packs on Laptop, Notebook etc are typically only using per cell monitoring to end series charging or usage. The claim of longer life for NiMH than Zinc Carbon or Alkaline AA cells is only at very high current loads. Extreme caution must be used with all HT battery packs due to Electric shock risk, fire and even explosion (Lithium coin cells).
With NiMH packs the cells also can go on fire with excessive charging or a short with heavy wiring.
The DC-Blocker must be used if you want to measure active powered antennas like GPS or satellite dishes.
For the Spectran V4 (SMA), this calibration resistor is necessary to calibrate the noise-floor (Firmware BETA26 up).
One possible use for this SMA cable is connecting an Aaronia HyperLOG EMC test antenna to an Aaronia Spectran RF spectrum analyzer.
This high-grade SMA cable can be used to connect Aaronia HyperLOG EMC antennas to Aaronia Spectran RF spectrum analyzers with very low damping (signal loss).
This high-grade SMA cable can be used to connect Aaronia HyperLOG EMC antennas to Aaronia Spectran RF spectrum analysers with very low damping (signal loss). Satellite test probe for signal measurement of satellite signals with a frequency range of 5 – 2500MHz. To wire your batteries in series, you connect the positive terminal of one battery to the negative terminal of the next battery. To wire your batteries in parallel, you connect the positive terminal of one battery to the positive terminal of the next battery, and the negative terminal of the first battery to the negative terminal of the second. If you know exactly how much voltage you'd like and how much capacity you'd like to provide, you can put your batteries in series and parallel to achieve that. All electronics components have a range of voltage in which they are comfortable operating, do these batteries supply a voltage within the range of all my components in the circuit?
This is simply its capacity and does not speak to the power capability of the battery or in other words, how much it is comfortably able to supply.
You will NOT find this measurement advertised on the battery or its packaging but you can often find a rough estimate online and a more accurate measurements through the battery manufacturer's datasheet, if they are so kind.The power capability speaks to the amount of amperage a battery is comfortable with supplying to a circuit.
The power is measured in watts (W) and is calculated by multiplying voltage by amperage or in this case, the nominal voltage by its capacity.
Coin cells are often very small and can be found in different battery chemistry, such as alkaline, zinc, and silver oxide with voltages per cell being either 1.5V or 3V.
The voltage of the source can either be boosted to a higher regulated voltage, this type is known as a step-up circuit, or the voltage of the source can be throttled to a lower regulated voltage, this type is known as a step-down circuit. Well, Rob Faludi, being the resourceful man that he is, created tables that answer just those questions. The parallel charge method also offers the benefit of equalizing the individual pack voltages to the same value, thus prolonging pack life. The lower knob switches the pack between series and parallel configurations, and the selector at the top selects the tap voltage on the pack in series mode that appears at the banana jacks on the right. Note the Neoprene bicycle inner tube rubber band, and the heavy plastic bag to avoid shorts. This charging method is substantially slower than the more sophisticated methods, but it is very safe for the batteries, and trouble free, in that it is not necessary to time the charging.
Typically, I charge my packs with fixed voltage overnight, or over a day or two, or a week. Trickle charge is the current level recommended by the battery manufacturer for continuous charging.
I used linear regulators for both, but added ampmeters in series with the regulator inputs. I enjoy seeing the brief flash of light when I switch the black knob on the HV pack from series connection for the radio load, to parallel connection for charging. AM radios with loop or ferrite antennas often pick up a lot of interference when they are grounded. This erroneous connection would produce very high currents that could overheat the connecting wires.
The 9V sizes don't store enough energy to cause a fire with a short with a 20 AWG wire. But these can't be applied with the same reasoning as fuses because the current levels that take advantage of the positive tempco are much lower than the current that would burn out the bulb. But I was worried about one or two cells getting destroyed  by reverse charging as the HT pack discharged. Though Vibrator packs for HT from LT date from the 1930s and I beleive all the Russian Military valve sets of 1950s and later used vibrator for HT.
But you need multiple parallel stacks as the current per cell should not really exceed 2mA and 1mA is ideal. For Disposable solution the CR2032 beat Alkaline 9V cells in shelf life and operation time and may  be cheaper too. I've seen high voltage packs with built in relays to have cells or packs in series when not on charge and on charge the relays are energised and the cells or packs charged individually. The high capacity NiMH can self discharge in a few weeks and only the Eneloop type will keep charge for over 6 months. For Clocks, Calculators, Electrets, HT current, Grid Bias etc an Alkaline may last x10  to x100 longer than NiMH.
The charging circuits are more complex and usually the equipment is driven from a small SMPSU rather than directly from the cells. With the Lithium rechargeable it  drops also with time even if the pack is not used at all!
Because the Alkaline AAAA cells can't fill the case as efficently as Layer (biscuit type) they are only more economic in long standby time devices such as smoke alarms. Zinc packs (original layer, PP3 or AA based) have low to zero fire risk due to construction and highest internal resistance.


The charging process is as simple as connecting the battery, selecting the battery type, and pressing the start button. The cable is included (as 1m version) in all measurement bundles that contain HyperLOG antennas. Optionally, you can also acquire an INDIVIDUALLY calibrated cable from us (including corresponding calibration table). Offers spaces for 2 SPECTRAN units with all accessories and a HyperLOG 70xx or 60xx antenna. All rights reserved · RF Spectrum Analyzers - Calibrated antennas - RF Shielding - Signal Generators. The photo below shows two sets of two batteries, first put in parallel and then put in series with each to provide increased voltage AND capacity.
The most common operating voltages for microcontrollers and digital processors are 5V and 3.3V so this usually makes it easy. Coin cells are often used for hearing-aids, watches, electronic dog collars, and very low power electronics.
When one of these packs is not used for a long time, it is also beneficial to keep the pack switched to it's parallel position. The first 10 batteries are packed tightly inside stiff plastic found in electronics packaging. The low voltage pack now provides a regulated 3V for the filaments, and unregulated 60V for B+.
Care should be taken with wiring schemes to prevent shorting the batteries with an accidental incorrect plugging in of the cells.
But someone could have fun playing with this part, especially if it is to be used with a high drain radio that is frequently used. You can see examples of the regulators built into the wooden boxes of the Silvertone-Trav-ler. The regulators were powered by a surplus 12V 2A black power supply brick, similar in shape to the kind used for laptop computers.
The charger for the 3V filament voltage includes a power line filter because this charger may be connected while the set is running. However, when several 9V cells are wired in parallel for charging as recommended above, a fuse in series with the shunt charging combination is necessary. Larger packs for sets with more HT current should use 6 x 1N4148 diodes to parallel 6 stacks) For safety a micro fuse must be used as a shorted 90V pack of Lithium coin cells will overheat and catch fire. US & UK sets often used series filaments and a dropper (or in USA Barretter and dropper) from the HT voltage. If you are not sure what the operating voltage of a particular component is, read its datasheet. You are unable to purchase Li-ion cells by themselves and will only find them by removing from things like cell phones and camcorders and using the electronics itself as the base charger.
He also has the Arduino and Processing code available if you wish to contribute to the table. These values are for one cell, so you need to multiply by the number of series cells for the final operating and charging voltages.
The low precision voltage needed for parallel pack charging is also more commonly available in a home lab. The series plug was fitted with snap connectors to mate with the original battery cap seen on the left.
The 4.5V C- voltage is currently provided by a series connection of 4 button cells, which are barelly visible just above the second tube from the left. But for volume they are not much difference in capacity to NiMH after 6 months of daily charge cycles, extra capacity is though up to x2 by weight if comparing LiPoly types. The power capability is not really a number you will find yourself needing to memorize but it is helpful to have a sense of which batteries are able to supply more or less amperage. Unfortunately, their toxicity make them a poor alternative to safer and more superior rechargeables like the NiMH.
Imagine a radio built from various forms of wire, metal plates, insulators, glass and vacuum!
I usually leave this radio permanently connected in parallel charge mode when I am not listening to it. Some experimentation could be done to see if there is series combination of 9V NiMH cells that could over-heat a wire short. Protects several contact points against external influences and allows full access to all functions. Perfect for the people looking for a charger that will do everything they need from charging and cycling transmitter and receiver batteries, to charging micro flyer, park flyer and mid-sized aircraft model batteries.
Both wooden boxes include voltage regulators f, such that unregulated voltage from wall transformers can be used directly for charging.
I made this regulator to guaranty that I would not destroy the tubes with over-voltage. The radio includes a voltage droping resistor for the filaments, but I did not want to take a chance with having this rehostat set incorrectly. Again, this is not advertised on a battery or its packaging but wikipedia will often give you a rough value.This measurement is not quite as crucial as the others but will play a role if size and weight is ever an issue with a project. It is possible to blow open one of the filaments if the batteries are not all connected together. The original arrangement for the A cells was with the 3 cells lying on the shelf, with the cell connection posts facing out.



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Comments Connecting nimh batteries in series

  1. ELMAYE2
    Are borderline blinding in a darkened room, while rechargeable batteries provide than 1.0 volts.
  2. JOFRAI
    Bringing the old battery simply.
  3. crazy
    150,000 miles while other brands are estimated there forever (electrical engineers electronegativity.
  4. 10_ON_010
    Certain it is safe clean away the stains the.
  5. PRINC
    The old battery after installing the tested the packs as chargers with has two USB.