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Welding Battery
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Here are some more information for Welding Battery:
Proper forklift battery maintenance can double the life of the unit and substantially reduce a company's equipment budget. Automated battery washers pay for themselves in a short time by helping to keep cells in tip top shape.
Why Wash Batteries?
Forklift batteries contain acid and some of that acid will leak out onto the terminals and the surface. If it overflows, it should be washed immediately -- but even in normal use a small amount of acid will contaminate the surface. The unit should routinely be washed at least every six months or more often in heavy use.
If left untended, the acid corrodes the terminals and can pose a safety hazard to workers handling the equipment. What many maintenance managers may not realize is that acid also acts as a conductor. This causes batteries to discharge even when not in use. If batteries aren't holding a charge for very long, this can be a symptom they need to be washed.
Battery Washers Make The Job Easy
Although forklift batteries can be washed by hand, the process is tedious and even dangerous as workers are exposed to toxic and corrosive chemicals. For large forklift fleets hand washing is impossible, and even small fleets will benefit from using automated washers.
Using battery washers is as simple as loading the cell and pushing a button. It is then is rinsed in an enclosed space so workers are not exposed to acid or heavy metals that might spray off during the cleaning process. Large battery washers can handle many units at once, washing each in turn without intervention. This frees workers up for more important tasks and reduces a company's staffing needs.
Washing The Wash Water
Another reason to use automated washers is that they collect the dirty water in a tank so it can be processed. Used wash water is contaminated with acid and heavy metals such as lead and copper. Lead is a particular concern since a few ounces of lead can contaminate hundreds of thousands of gallons of groundwater. Companies that let wash water go down the drain or soak into the ground are not only damaging the environment but are subject to significant financial penalties.
Professional industrial waste water treatment contractors charge high fees for cleaning wash water, so many companies prefer to buy their own filtration systems. These filters neutralize the acid and remove the heavy metals from the water. The water is then recycled back to battery washers rather than being dumped down the drain. The best form of recycling is reuse.
Proper maintenance keeps your forklift fleet running and saves your company money. This applies to batteries as well. Invest in a battery washer and filtration system to extend the unit's life and reduce operating costs.
Author is a freelance writer. For more information on industrial wastewater treatment please visit http://www.multi-shifter.com.
How to service laptop batteries
How to service laptop batteries
Most laptops batteries are 'smart', meaning that some form of communications occurs between the battery and user. The definition of 'smart' varies among manufacturers and regulatory authorities. Some manufacturers call their batteries 'smart' by simply adding a chip that sets the charger to the correct charge algorithm. The Smart Battery System (SBS) forum states that a 'smart' battery must provide state-of-charge (SoC) indications.
There are two common architectures of 'smart' batteries, consisting of the single wire system found on high-end cameras and radio communications devices, and the two-wire system typically used on laptops. The two-wire system is usually configured to the System Management Bus (SMBus). Because of its common use in laptops, we will focus on the SMBus system. Figure 1 shows the layout.
Figure 1: Two-wire SMBus system.
The SMBus is based on a two-wire system using a standardized communications protocol. This system lends itself to standardized state-of-charge and state-of-health measurements.
Battery connection
The SMBus battery has five or more battery connections consisting of positive and negative battery terminals, thermistor, clock and data. The connections are commonly unmarked and attempting to test this type of battery appears complicated. Figure 2 describes the functions of a battery with 6 connections.
Figure 2: Connections of a typical laptop battery.
The positive and negative terminals are usually placed on the outside; no norm exists on the arrangement of the contacts.
The positive and negative battery terminals are commonly located at the outer edges of the connector. The inner contacts accommodate the clock and data. (On a one-wire system, clock and date are combined.) For safety reasons, a separate thermistor wire is brought to the outside. This allows temperature protection if the digital communication is disabled.
Some batteries are equipped with a solid-state switch that is normally in the off position. In such a case, no voltage is present. Connecting the switch terminal to ground will turn the battery on. If this does not work, a proprietary code may be needed to activate the battery. How can I find the correct terminals? To begin with, use a voltmeter to locate the positive and negative battery terminals. Establish the polarity. If no voltage is available, a solid-state switch may need to be activated. With the voltmeter connected on the outer terminals, take a 100-Ohm resistor (other values may also work), connect one end of the resistor to ground, and with the other end touch each terminal while observing the voltmeter. If no voltage appears, the battery may be dead or the pack requires a digital code to activate. The resistor protects the battery against a possible electrical short.
Once the connection to the battery terminals is established, charging should be possible. If the charge current stops after 30 seconds, an activation code may be required. This code is often difficult, if not impossible to obtain.
Some battery manufacturers even add an end-of-battery-life switch. At a preset age, cycle count or capacity level, the battery stops functioning. Manufacturers explain that customer satisfaction and safety can only be guaranteed if the battery is regularly replaced. Such policy tends to satisfy the manufacturer more than the user. Newer batteries generally do not have this feature.
It is recommended to utilize the thermistor during charge and discharge to protect the battery against over heating. The thermistor can be measured with the Ohmmeter. The most common thermistors are 10 Kilo Ohm NTC or 10kOhm at 20°C (68°F). NTC stands for negative temperature coefficient, meaning that the resistance decreases with rising temperature. A positive temperature coefficient (PTC) will increase the resistance. Warming the battery with your hand may be sufficient to detect a small change in resistor value.
An SMBus battery contains permanent and temporary data. The permanent data is programmed into the battery at time of manufacturing and includes battery ID number, battery type, serial number, manufacturer and date of manufacture. The temporary data is acquired during use and consists of cycle count, user pattern and maintenance requirements. Some of this information is renewed during the life of the battery.
Repairing a 'smart' battery
Laptop batteries can be repaired but the work is often time consuming. The success rate varies with battery type. One must remember that the 'smart' battery consists of two parts, the chemical cells and the digital circuit. In some cases, the chemical battery can be fully restored but the fuel gauge may be inaccurate or its data is corrupt.
Anyone attempting to repair SMBus battery must be aware of some non-compliance. Unlike other tightly regulated standards, the SMBus allows some variations. This may cause problems with existing chargers and the SMBus battery should be checked for compatibility before use. More information on SMBus is available on www.sbs-forum.org and www.acpi.info. If the cells are weak, cell replacement makes economic sense. While nickel-based cells are readily available, lithium-ion cells are not sold on the open market. This precaution is understandable when considering the danger of explosion and fire if the cells are assembled in a careless way. Always replace the pack with the same chemistry cells.
During cell replacement, the circuit of the 'smart' battery may need to be kept alive with a supply voltage. Disconnecting the circuit, if only for a fraction of a second, can erase vital data and render the circuit unusable. To assure continued operation when changing the cells, connect a secondary voltage through a 100-Ohm resistor before disconnecting the cells. Remove the secondary supply only after the circuit is fed from the new cells.
The open terminal voltages of the replacement cells should be within 10% of each other. Welding the cells is the only reliable way to get dependable service. Attention must be paid to limiting the amount of heat transferred to the cells during welding. Excess heat can damage the cells.
During storage, each cell may have self-discharged to a different charge level. This is especially evident on nickel-based batteries. To assure proper charge of all cells without overcharging some, trickle charge the newly repaired pack for about 14 hours, then discharge and recharge normally. Such a cycle is also needed to reset the battery's fuel gauge circuit. Lithium-ion can accept a normal charge in about 3 hours. The service should also include calibrating the battery. (Refer to "Choosing the right battery for portable computing", Part Two).
About the Author
Battery-company.com.au offers high quality replacement laptop batteries, brands as Sony laptop batteries, JVC laptop batteries, Canon laptop batteries, Toshiba laptop batteries...
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How to make a welder out of a 9v battery and throw away camera flash?
A while back I was at a bar and a guy started talking about how his buddy got in trouble in school for making a small ARC welder out of a 9v battery and a throw away camera flash. He said they welded metal pen caps together and they used small paperclips as the welding rod. Does anyone know how they made the welder? Please tell me and include pictures if you can.
A 9v battery is not going to have the current (amperes) to start an arc to weld a metal pen cap in my opinion. You can see how others use car batteries for welding, just Google "welding with car battery." Even those large car batteries have to be wired in series in order to increase the amperage and voltage to sustain a weld.
All welding is basically a circuit, you have a ground (the metal you wish to weld together) with your negative lead attached to it then you have a positive lead that is connected to your fusing material (welding rod), you strike the welding rod against the material to complete the circuit allowing current to flow through the rod and essentially melt because of the high current/volt.
To try to replicate your 9v battery trick I would take 3 9v batteries, then connect a wire from positive lead of the first battery to the negative of the second. Then attach the positive lead of the 2nd battery to the negative of the 3rd battery. You need to attach the first batteries negative terminal to the workpiece (metal cap) and then connect the positive lead of the third battery to the welding rod (paper clip). Be careful because the arc will blind you so you need a welding mask and the batteries can explode.
All and all a really poor idea, I would not try this. Even when I have welded with car batteries I had them far from me and I had a welding blanket over them in-case they blew up.
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