The reason the laptop charger is so big is wattage, NOT voltage. That is why i mentioned the USB charger. OP said the reason was voltage. That is not correct. It''s simply not. It''s all done with integrated circuits. plus if the battery is discharged it will need to charge that too (perhaps add 20W or so for that.) Since the design engineer
Why so many power tools are sold this way is an interesting question. To make things even more difficult, power tool batteries are not exactly standardized. You may end up buying a battery that visually matches the pins on your power tool
Time for a battery replacement, anyway. Had an iPhone swell, but they replaced it with a new one for $29 (under that special battery replacement program the had some time back.) I have a Latitude 7400 so will keep an eye on it. I can only assume Dell cheaps out on quality battery design, engineering, materials, testing.
The generator alone is 500, but the model with 2 batteries is 1k. So 2 7.5amp batteries for $500 and those will have the new gauge on them them as well. Personally I feel like the trick with going battery is to decide on a product line and go all in, so you can spread the use of the batteries across all your devices.
Batteries are expensive but there are things you can do to minimize the cost. Don''t buy ''em at the Quickie-Mart- you''ll pay twice as much. Instead, buy them at a big box place or CostCo and when you do, get them in bulk. You''ll pay less per battery and and you''ll have plenty to
D batteries are 1.5 V and provide 18-27 Wh of energy. Most D batteries sold at alkaline, and they can''t be recharged A car battery is 12 V (8 x 1.5 V cells) and stores on the order of 576 Wh of energy (20-30x as much). Most of these batteries are lead-acid and can be recharged (which a car needs because it takes a lot of power to start the car).
The reason batteries come in so many types has as much to do with history as innovation. News. A lead-acid battery has to be big enough to provide enough charge to start a car. It also has to
My battery is so big and with 3 heavy duty inter-connectors between each stack it spreads the load out really nicely! Even in summer my batteries don''t even get warm! After all this time all the modules are still within 0.01 volt''s of each other.
Older phones were an LCD screen circuit board battery back side sandwich, which was a lot cheaper to make, but also wasted a lot of space compared to today. Laptop batteries usually already take up the full width and depth of a laptop, so the only way to improve inside is to shrink the mainboard, which is difficult with active cooling.
A lead-acid battery has to be big enough to provide enough charge to start a car. It also has to be usable in cold climates and last many years. Since the electrolyte is a corrosive acid, the external casing has to be Why batteries come in so many sizes and shapes Created Date:
My battery is so big and with 3 heavy duty inter-connectors between each stack it spreads the load out really nicely! Even in summer my batteries don''t even get warm! After all this time all the modules are still within 0.01 volt''s of each other. So no,
The big 12 V batteries used in cars are designed to hold enough energy to get a car started even when the engine is somewhat stuck. They have to supply a lot of current, so they need big surfaces for the current to flow through. The chemical makeup of the battery also matters, since different chemical combinations have different energy densities.
Ever wondered why a car battery is so heavy even though at first it doesn''t appear to be? In this article, I''ll be sharing why a car battery is so heavy. Plus, designers are more concerned with reliability and convenience, so the weight isn''t a big focus for them. Since lead-acid batteries use lead, there is an unavoidable weight that is
Let''s assume cost scales with capacity. My 26-cell lithium battery has 26·11.1Wh=288.6Wh energy. So we need to scale that by 1.25 to achieve the same 360Wh as the lead-acid battery. Such a cell weighs around 90g. So the weight of the cells is 26·90 g = 2.34 kg.
Why so many power tools are sold this way is an interesting question. To make things even more difficult, power tool batteries are not exactly standardized. You may end up buying a battery that visually matches the pins on your power tool only to discover that it won''t adequately charge it.
At large values it''s a pretty big difference. edit: thanks u/Dr9 for pointing out my mistake. AA batteries are, which is why there is a much higher supply of AA versus AAA ELI5 why Antarctica is so much more colder than the Arctic?
So, too, with batteries you can have one big battery to produce a lot of charge, but either it''ll have to have too much voltage when it''s full or too little when it''s almost empty. Instead, use a bunch of smaller batteries together so you get the charge you need but they all stay within the same smaller range of full and empty.
So that means 4k is pretty much permits, getting the people there, planning and etc. So now a 13.5kwh went from 851.85/kwh to 518.52/kwh. Then you have other fixed costs. In an EV you have 1 big battery system. But with storage batteries, you have multiple systems that must each be capable of functioning independently.
mAh are not enough to judge the capacity of a battery, you need to know the voltage as well. For a cell phone that is usually 3.7V. For example, 5000mAh*3.7V=18500mWh or 18.5Wh. My laptop battery has 63Wh and is made out of 4 cells, thus the voltage is higher, resulting in a much higher capacity despite lower/comparable amount of mAh.
(the 18650 is so common that many bigger li-ion batteries are just bunch of 18650 sildered together) The two batteries I used as examples were just single random batteries I looked up on a random web stores. There are pretty big variances on
Per kilogram the number of jewels of energy inside gasoline is much larger than the energy content of a battery, so it takes a very large cumbersome battery to compensate for the energy contained
So a battery can be correctly labelled and in full health but we need to know the hour rate used by the manufacturer to get ''4ah'' Why the big difference between Lead Acid and Lithium? Lead Acid batteries are a basic design and the materials and chemicals that make up the product can easily be damaged by fast discharging and charging.
Batteries are a critical component of our modern world, powering everything from our smartphones to electric cars but it is very hard to make them smaller and lighter. The fundamentalContinue Reading
Understanding why are car batteries so heavy provides insight into the engineering and materials required to power modern vehicles. From traditional lead-acid batteries to advanced lithium-ion
So a laptop battery with 15V and 2500 mAh actually has 37.5 Wh of energy, whereas a smartphone battery with just 5V and 2500 mAh has mere 12.5 Wh of energy. Notebooks require so much more power because their hardware is orders (not orders, just up to an order) of magnitude faster than smartphone hardware. Don''t let the CPU clock speed fool
Not so easy with a huge battery. The batteries need to be cooled. If they''re made of lots of smaller parts, running some kind of cooling system through them gets a lot easier. Hot batteries are also prone to expanding, so separate batteries will
To understand why batteries come in many different sizes and shapes—and serve many purposes—look to the past, at how batteries originated and how they have developed over the years. The first batteries were made in
The most common "12 V" batteries are probably car batteries. We want them to be able to store a huge amount of energy (eg, so you can sit in the car for 15 minutes with the lights on, and they can still provide a big enough "kick" to start the engine). Car batteries use Lead and a
Every Wednesday, Michio Kaku will be answering reader questions about physics and futuristic science. If you have a question for Dr. Kaku, just post it in the comments section below []
Battery technology has moved so far in the last 100 years. The lead-acid starter battery became common in cars in 1920, lead is essentially poison, and sulphuric/lead acid
So they don''t melt. Chargers aren''t big because they''re doing a complex job, they''re big because they''re converting the high voltage AC current from the wall to low voltage DC current that won''t fry the delicate components. This generates waste heat, and so the power brick has to be big in order to handle and dissipate that heat.
Why is apple doing this? 3300 mAh in a 800 dollar phone seems crazy to me. Also the Pixel 7a and iPhone 15 are the exact same size, 6.1 inch. EDIT: to people saying the iPhone 15 isn''t flagship, I disagree. It''s 800 dollars. Even if it isn''t the iPhone 15 pro has the same battery size so it doesn''t even matter.
There are dozens of different types of batteries, from alkaline to lithium-ion, but why are there so many? And where are batteries heading in the future?
So why are Li-ion batteries such a big deal? From a mechanics standpoint, they are unique in how they are not a purely chemical reaction (such as that of lead-acid batteries) and instead provide energy through ion movement between each cell''s anode and cathode.. They boast a superior weight to energy ratio when compared to earlier batteries such as lead-acid, Ni-MH and Ni-Cd
A 5Ah would be at Medium batteries 90Wh a large 9Ah at 168Wh Compare that to the phones with the largest batteries like an iPhone 14 Pro Max that is at 16.68 Wh 4323mAh at 3.85V The fast charge on the phone is 50% in 30 minutes so 16.68 Watts. This is when the batteries have a low charge rate and the charge is faster.
Even if batteries for different devices come in different configurations and shells, inside they are made of standard battery components which are mass produced. There is no point making a new battery for every device model, so you just take standard parts and fit em together to get a battery system for your needs.
An EV uses the same rechargeable lithium-ion batteries that are in your laptop or mobile phone, they''re just much bigger — cells grouped in packs resembling big suitcases — to enable them to
Each battery, small or large, uses 15 PCU. In a PCU-limited server, using a small grid battery bank of 3 large blocks (so around 20 small grid batteries, or a little bit more than 6 large grid batteries in terms of power) will use 300 PCU when the equivalent 6 large grid batteries will use only 90 PCU (although double as much space).
LiFePO4 batteries last much longer than lead acid batteries, so have to be replaced much less frequently. Lead acid batteries also degrade if regularly discharged below 50%. These two factors make LiFePO4 usually more cost effective in the long run, even if initial cost is higher.
To understand why batteries come in many different sizes and shapes – and serve many purposes – look to the past, at how batteries originated and how they have developed over the years.
Electric cars have become increasingly popular in recent years. One key feature that sets them apart is their large, heavy batteries. These batteries power the vehicle
When you buy a ''home battery'', you''re buying a battery that''s MAYBE 15 KWh. So, not nearly as ''bulk''. So you get a worse pricing per KWh. Also, the ''home battery'' has to have management stuff, inverter, etc.; Just like the EV battery isn''t the entire car,
Batteries are made in certain sizes and shapes for reasons of cost and manufacturability, but in other cases because of legacy manufacturing processes. Market demand also plays a role.
It also has to be usable in cold climates and last many years. Since the electrolyte is a corrosive acid, the external casing has to be tough to protect people and car parts from any possible harm. Knowing all this, it makes sense that modern lead-acid batteries are blocky and heavy.
Unfortunately, this led to hundreds of different batteries being produced that were only good for a limited amount of objects. This was obviously inefficient, so the head honchos of the battery industry, along with various government agencies and manufacturers, decided to standardize battery sizes.
While you can buy lightweight models, car battery weight doesn't negatively impact most vehicles. However, keep your eyes open as new options continue to present themselves. Also, the heavier and larger car batteries in electric cars are worth it. Consider the power and functionality of the battery as opposed to its weight.
Given the broad use of and dependence upon electricity in our modern, on-the-go, technologically tuned in world, we have had to create a vast array of different batteries to effectively store and discharge energy for a huge variety of tasks.
Car batteries are much bigger than the AA or C batteries you have in your junk drawer at home. Common sense tells us that larger items usually weigh significantly more than smaller items. The size does not refer to the power of the battery. The only thing it describes is the dimensions of the car battery.
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