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Lithium-ion batteries are the most common battery in consumer electronics. They are used in everything from cellphones to power tools to electric cars and more. However, they have well defined characteristics that cause them to wear out, and understanding these characteristics can help you to double the life of your batteries — or more. This is especially useful for products that do not have replaceable batteries.

Battery wear is loss of capacity and/or increased internal resistance. The latter is not a well-known concept, but over time the battery is able to put out less amperage as the battery ages, and eventually the battery is unable to generate power quickly enough to operate the appliance at all even though the battery is not empty.

The standard disclaimers apply, all advice is for informational purposes only, CleanTechnica is not responsible for any damages caused by inaccurate information or following any advice provided. Also, new technology may change the characteristics spoken about, making them less or more relevant in the future or even rendering them obsolete.


Lithium batteries age from the following factors:

These articles explain each facet in detail and are worth reviewing if you’re interested in understanding the logic behind the following recommendations.

Time

Try to buy batteries when you need them, because lithium ion ages from the moment it leaves the assembly line. However, by following the recommendations below you can get a longer lifetime from the batteries you own. If possible, look for the date stamp on any battery powered item you intend to buy and try get the newest one. Often you will find it on there, either on the outside of the package or on the item itself.

Charging Cycles

One cycle is fully charging the battery and then fully draining it. Lithium-ion batteries are often rated to last from 300-15,000 full cycles. However, often you don’t know which brand/model of battery is in the item you buy.

Partial cycles will give you many more cycles before the battery wears out, so when possible do partial discharges and then recharge. Don’t intentionally drain a battery before recharging for lithium-ion batteries.

For some equipment this is not realistic, in electric lawnmowers and other outdoor tools for example, but the manufacturer will hopefully have selected a battery chemistry designed for this use case.

Storage/Operating Temperature

Try to keep your batteries cool whenever possible. Don’t store a cellphone or other portable lithium battery in a car on a hot day, and keep them cool when not in use (bring your portable tool batteries inside instead of leaving them in an unconditioned shed/garage). Park an electric vehicle in the shade or a reasonable temperature garage when possible. Many EVs have active cooling of batteries so that will take care of this for you, although you still save battery power by parking in the shade or a conditioned garage.

Also, your pocket is about 30ºC, so store your cellphone on a desk and out of direct sunlight if you’re in the office or at home when practical.

Charging Characteristics

Charge your battery at a slow rate when possible. For a cellphone, use a charger that is rated for about 1/4 of the battery capacity if you can. Avoid quick charging except for rare instances when you absolutely need the most juice as quickly as possible. Charging at 1/2 its capacity per hour is acceptable but chargers that can charge a phone in under 1.5 hours from empty can be very hard on the battery.

For power tools, try to get a slow charger instead of the quick chargers many of them come with. This is not always possible, but often is.

Don’t leave any device connected to the charger once charging is complete. In fact, you should aim to charge to a maximum of 80% (more on that below).

Discharging Characteristics

Try not to abuse your battery by pulling as much power as quickly from it as possible. For an EV, flooring the acceleration pedal on a regular basis is not good for the battery. Similarly, power hungry games can drain cellphone batteries quite quickly as well. If your phone gets hot from high power use (and not the sun or high room temperature), it is an indication that you are punishing the battery.

Sometimes taking it easy on batteries is not always possible because some products, such as lithium-ion powered tools, are hard on the battery by design (drills, lawnmower, snowblowers, etc.). In these cases, manufacturers will typically use batteries designed for high drain rates (but have lower capacity), but anything you can do to be gentle on even these batteries will pay dividends in longer life. For power banks, try to use the power at a moderate rate. USB models can be tricky to limit your current draw rate as a phone or tablet will draw what it wants up to the bank limit, but for non-USB items you can often try to limit how quickly it’s drawing power.

Also you can “hack” this issue by buying and using a larger capacity battery if your device can handle it. For the same power draw, a larger capacity battery will have a lower percent drain per hour. This also reduces cycle count.

For items you don’t use daily, check on your batteries from time to time in case they are draining themselves when not in use. For EVs and cellphones, this is not a noticeable problem, but for power tools and power banks it is a good idea to check on the battery every few months (or weeks if it drains itself quickly) and top it up to 50%-ish for storage.

Depth Of Charge

Unlike most other battery types (especially lead acid), lithium-ion batteries do not like being stored at high charge levels. Charging and then storing them above 80% hastens capacity loss. So charge the battery to 80% or a bit less if that will get you through the day/week. Most EVs have the ability to select a percentage to charge up to in the software.

Charging above 80% is not a big problem if you intend to draw it down quickly and need the full capacity. Of course, try not to do this regularly if you don’t have to. Avoid overnight charging of your phone unless it has a smart charging feature, such as some Apple phones. For Android phones, use Accubattery software or similar, which will beep at 80% charge as a reminder to unplug the cord. Charge to full in the morning if needed to get through the day.

Similarly, for your EV if you have a long driving day planned, setting the software to charge to full by morning (not storing the vehicle overnight at full) and driving until you are below 80% rather quickly will not cause much extra wear to your batteries.

In general, it’s the storage time above 75-80% that causes most of the extra high charge wear.

For storing batteries long term, charge them to about 50% and check on them every now and then.

Depth Of Discharge

According to many sources, lithium-ion doesn’t like being fully discharged. So try to avoid draining your batteries below about 25% when possible. If unavoidable, then charge it back up to above 25% as soon as possible so the time spent near empty is minimized.

Miscellaneous Battery Information

  • Lithium-ion batteries have no memory effect. This was a facet of Nickel Cadmium batteries that went out of style decades ago, yet this is a surprisingly common question people ask about any rechargeable battery.
  • Most name-brand devices use quality name-brand batteries, but some devices (such as cheap power banks or no-name products) use off-brand or grey market batteries that will not last for years no matter how much you baby them. Try to avoid buying products with these batteries because the money you save buying them translates into reduced product life.
  • For some devices, the charge gauge can fall out of calibration and give you incorrect readings. This can typically be fixed by either fully charging or fully discharging then recharging the battery back to full. However this is hard on the battery, so it’s not something you want to do regularly, but in the rare instance that this is the cause of your issues, then a full charge or charge-discharge cycle will solve it. Quickly draw the battery back down to 80% before putting it back in service.
  • Everything stated above is quite generalized, and with the various battery chemistries on the market, all of them have slightly different characteristics. Once facet may be stronger in one chemistry vs. another but in general the advice provided is applicable to all lithium battery chemistries.

End Of Life (EOL)

End of life for a lithium-ion battery typically occurs when the battery can no longer perform the function the user requires of it. Commercially, when a battery (pack) has reached 80% of its design capacity it is considered EOL, but for end users, it’s typically looked at as when the device (or battery pack) becomes unusable.

When your battery starts acting funny, it can mean it’s ready to be retired. Some Apple phones have the ability to calculate capacity remaining (it is buried in the settings) and Accubattery for Android can do the same thing if installed and used for at least a week.

These are some of the strange quirks you may run into that can occur with worn out lithium-ion batteries:

  • Device shuts down stating low battery even though it should have plenty of runtime left, even if it stated a decent percent charge remaining just minutes before
  • The battery percentage meter drops randomly
  • Charging finishes prematurely even though the battery did not accept much power
  • Sudden capacity drops without warning
  • Self-discharge rate soars and is often uneven
  • The battery (pack) gets very hot during charging (sometimes the charger shuts down due to this)
  • Pouch batteries can start bulging (seen on some cell phones)

Be sure to recycle all batteries at the end of their life as they contain valuable materials that can be recycled into new batteries.


A summary of the terminology used in the battery world:

Charging algorithm = Battery is charged at Constant Current, then near full charge (typically over 80%) the charger switches to Constant Voltage. The charging rate slows until the battery reaches 100% charge. Many EVs modify this algorithm.

C = Capacity of the battery

  • Battery ability to output power is measured in 1/C. 1C means the battery drained in one hour, 2C means 30 minutes (1/2 hour), 3C means empty in 20 minutes (1/3 of an hour) and so forth.
  • Charging can also be measured in C, 1C means charged in 1 hour, 0.5C charged in 2 hours, 2C charged in 30 minutes and so forth.
    Charge rates are not typically linear, the battery is typically charged more rapidly until it reaches the Constant Voltage stage.

Series = Multiple batteries linked in a chain to increase the total voltage of the pack.

Parallel = Multiple batteries linked side by side to increase amperage instead of voltage.

(x)S(x)P configuration = explains how multiple batteries are linked. 4S2P for example means 8 cells, four in Series and two Parallel rows

Volts (V) = Electric potential. Power outlets are measured in volts.

Amps (A)= Number of Coulombs of electrons carrying those volts.

Watts (W)= Volts x Amps. Energy/Power usage is often measured in watts. A kilowatt is 1000 watts. kWh is Kilowatts per hour.

Energy is measured in Joules and is convertible to Watts/second if you have a time component.

Power = Energy over Time. Typically measured in Watts. One Joule per second is 1 watt. The same number of Joules or Watts in half the time is twice the power.

Nominal voltage = Voltage used to calculate Watts of a battery.

Battery capacity = How many Ah of power the battery can output (when new).

Load = Device that uses the power from the battery.

Internal resistance of a battery affects its Power output. Increased internal resistance is the reduction in rate of Power output the battery can deliver. Energy output is affected somewhat by increased internal resistance.



 


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Nissan feels the heat from BYD’s EV price war in China

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Nissan feels the heat from BYD's EV price war in China

Nissan is the latest victim of BYD’s “liberation battle” against gas-powered cars. After BYD’s aggressive price cuts this year, Nissan is shutting down a factory in China as it struggles to keep up.

As is the case for many legacy automakers, China is a critical sales market for Nissan. Nearly a third of Nissan’s global sales and net profits are from China.

After slipping out of the top five automakers (by market share) in China in 2022, Nissan’s woes are worsening. Nissan’s sales fell 16% in China last year and the trend has continued into 2024.

Nissan’s sales fell another 2.8% last month, with 64,233 vehicles sold in China. The company cut guidance by 23% last year, with 800,000 vehicle sales expected in fiscal 2024. According to Nikkei, Nissan will do so with one less factory.

Nissan is closing the doors to its plant in Changzhou as the factory is building more cars than it can sell.

The facility accounts for about 8% of Nissan’s production capacity in China, with an annual capacity of around 130,000 units. According to the report, the plant shuts down on Friday.

Nissan-BYD's-EV
Nissan Ariya electric SUV (Source: Nissan)

Under its joint venture with China’s Dongfeng Motor, Nissan has eight plants in the region. Its total annual capacity is around 1.6 million, double Nissan’s projected sales figures for fiscal 2024.

Nissan shuts down China plant amid BYD’s EV price war

The plant shutdown comes as Nissan struggles to keep up in an increasingly competitive China EV market.

China’s largest automaker, BYD, kicked off a “liberation battle” against ICE vehicles earlier this year. The goal is to continue taking market share from gas-powered cars with lower-priced EVs. So far, it seems to be working.

Nissan-BYD's-EVs
BYD (Dolphin Mini) Seagull EV (Source: Nissan)

BYD has drastically cut prices while introducing lower-priced EV models. Its cheapest, the Seagull EV, starts under $10,000 (69,800 yuan).

BYD’s CEO, Wang Chaunfu, said EVs have entered “the knockout round” and that the next two years will be critical for automakers to catch up.

With lower-priced, more advanced models hitting the market, BYD sees joint venture brands (like Nissan’s) market share falling from around 40% to 10% in China.

Nissan isn’t the only legacy automaker feeling the heat. Japanese rivals Toyota, Mitsubishi, and Honda have also pulled back in China amid slumping sales.

Nissan-BYD's-EV
Nissan EV concepts (Source: Nissan)

Meanwhile, BYD looks to expand its global footprint after outgrowing China’s EV market. BYD is closing in on a deal for a plant in Mexico that would be among the biggest in the country. The company expects to sell 50,000 vehicles in Mexico this year.

BYD is also expanding on Nissan and Toyota’s home turf. According to data from the Japan Automobile Importers Association, BYD accounted for over 20% of Japan’s EV imports in January.

With longer-range, lower-priced models rolling out, BYD’s momentum is expected to continue. China’s leading automaker is also expanding into new segments like pickups (check out the new Shark PHEV), mid-size electric SUVs, and luxury.

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Tesla Model 3 Long Range costs $3,200 more to finance than last week

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Tesla Model 3 Long Range costs ,200 more to finance than last week

Tesla scrapped promotional financing on the Model 3 Long Range this week after it became eligible for the $7,500 federal tax credit.

As Electrek reported on June 17, Tesla and the IRS confirmed that the Model 3 Long Range All-Wheel Drive is now eligible for the full tax credit. Today, Tesla is pricing the EV’s upfront purchase price at just $34,990 – $1,000 more than the Model 3 Rear Wheel Drive – including the federal tax credit and an estimated five-year gas savings of $5,000.

The Model 3 Rear Wheel Drive still doesn’t qualify for the federal tax credit because it uses LFP battery cells from China.

The Model 3 Long Range is now listed at 6.39% APR on loans up to 72 months. The Model 3 Rear-Wheel Drive continues to offer 1.99% APR for 36 months with a 60-month option at 2.99%.

Even though the Model 3 Long Range is now $7,500 cheaper, the higher interest rate is a bit of a party pooper, as it eats up potential savings. The folks at CarsDirect estimated that on a five-year loan, thanks to the 6.39% interest rate, the Model 3 Long Range has more of a $4,200 advantage than a $7,500 advantage.

If you’re eligible for the federal tax credit, the Model 3 Long Range is cheaper than before but costs around $3,200 more to finance through Tesla than last week. CarsDirect suggests comparing your options carefully if you’re shopping for a Model 3 Long Range. 

Click here to find a local dealer that may have the Model 3 in stock –affiliate link


If you live in an area that has frequent natural disaster events, and are interested in making your home more resilient to power outages, consider going solar and adding a battery storage system. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. They have hundreds of pre-vetted solar installers competing for your business, ensuring you get high quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use and you won’t get sales calls until you select an installer and share your phone number with them.

Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisers to help you every step of the way. Get started here. –affiliate link*

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Utah is getting 20 ‘hyper-fast’ Electrify America EV charging stations

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Utah is getting 20 'hyper-fast' Electrify America EV charging stations

Electrify America and electric utility Rocky Mountain Power have rolled out the first of 20 DC fast charging stations in Utah.

Electrify Commercial, a business unit of Electrify America, and Rocky Mountain Power, a division of PacifiCorp, are deploying more than 80 chargers at 15 DC fast charging stations in the Salt Lake City area and five DC fast charging stations in surrounding regions.

So far, four charging stations have come online in Millcreek, Vernal, Moab, and Kimball Junction.

Rocky Mountain Power, the only rate-regulated public utility providing electric service in Utah, will own the new charging stations. Each will have “hyper-fast” chargers capable of speeds up to 350 kW. The utility will set the pricing and Rocky Mountain Power utility customers get a discounted rate.

Since 2016, Rocky Mountain Power has installed more than 120 DC fast chargers in Utah and completed an electric highway corridor along I-15, Utah’s primary and only north-south interstate highway. It’s also facilitated the installation of more than 3,000 Level 2 chargers for workplaces, retail, and multifamily housing. The utility is spending $50 million to install EV charging infrastructure across Utah.

All 20 of Utah’s new DC fast charging stations will be on Electrify America’s coast-to-coast “locate a charger” map, which includes more than 950 stations and over 4,250 chargers in the US and Canada. Drivers will be able to access and pay for charging on Rocky Mountain Power’s chargers through the Electrify America mobile app.

Read more: Here’s what Electrify America’s EV charging plans are for 2024


To limit power outages and make your home more resilient, consider going solar with a battery storage system. In order to find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. They have hundreds of pre-vetted solar installers competing for your business, ensuring you get high quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use and you won’t get sales calls until you select an installer and you share your phone number with them.

Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisers to help you every step of the way. Get started here. –affiliate link*

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