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Harvard solid state battery
Image: Adden Energy

Researchers at Harvard University have developed a solid state battery that can be recharged in 10 minutes, and now it’s got Series A funding to scale production.

October 23 update: Adden Energy has raised $15 million in a Series A round led by At One Ventures with participation from Primavera Capital Group, Rhapsody Venture Partners, and MassVentures to scale production and bring solid state battery technology to car manufacturers.

The company will use the funding to construct a roll-to-roll pilot line production facility at its headquarters in Waltham, Massachusetts.

Adden Energy has already demonstrated technology that can deliver its battery in EV-compatible, commercially compatible pouch cell form-factors; this Series A-funded production line will enable it to scale the size of the batteries 100x.

Laurie Menoud, partner at At One Ventures and board member at Adden Energy, said, “Our investment in this technology is a signal of how important we know this to be, and it’s also our confidence level in Adden Energy’s ability to win market share through competitive unit economics. With the added energy density of lithium metal anodes, the cost per kilowatt hour is going to drop by 30%, and that is going to be a significant driver of adoption.”

Adden Energy says its next-generation batteries are on track to reach the goal of EV parity with internal combustion engines by 2028.

Harvard’s latest solid-state battery breakthrough

January 15, 2024: The lithium metal battery researchers developed at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) can also be charged and discharged at least 6,000 times — more than any other pouch battery cell.

The research published in Nature Materials describes a new way to make solid-state batteries with a lithium metal anode. Xin Li, Associate Professor of Materials Science at SEAS and senior author of the paper, said:

Lithium metal anode batteries are considered the holy grail of batteries because they have ten times the capacity of commercial graphite anodes and could drastically increase the driving distance of electric vehicles.

Our research is an important step toward more practical solid-state batteries for industrial and commercial applications.

One of the biggest challenges in designing solid-state batteries is the formation of dendrites on the surface of the anode. Dendrites are projections of metal that can build up on the lithium surface and grow like roots into the electrolyte. They pierce the barrier that separates the anode and cathode, causing the battery to short or even catch fire.

The dendrites form when lithium ions move from the cathode to the anode during charging, attaching to the surface of the anode in a process called plating. That creates an uneven, non-homogeneous surface on the anode, and allows dendrites to take root.

When discharged, that plaque-like coating needs to be stripped from the anode, and when plating is uneven, the stripping process can be slow and result in potholes that induce even more uneven plating in the next charge.

In 2021, the team designed a multilayer battery that sandwiched different materials of varying stabilities between the anode and cathode. This design prevented the penetration of lithium dendrites by controlling and containing them – but it didn’t stop them altogether.

But in this latest research, the researchers stop dendrites from forming by using micron-sized silicon particles in the anode to constrict the lithiation reaction and facilitate homogeneous plating of a thick layer of lithium metal.

In the Harvard researchers’ design, when lithium ions move from the cathode to the anode during charging, the lithiation reaction is constricted at the shallow surface and the ions attach to the surface of the silicon particle, but don’t penetrate further.

“In our design, lithium metal gets wrapped around the silicon particle, like a hard chocolate shell around a hazelnut core in a chocolate truffle,” said Li.

And, because plating and stripping can happen quickly on an even surface, the battery can recharge in about 10 minutes.

The researchers built a postage stamp-sized pouch cell version of the battery, which is 10 to 20 times larger than the coin cell made in most university labs. The solid-state battery retained 80% of its capacity after 6,000 cycles, outperforming other pouch cell batteries on the market today.

Harvard Office of Technology Development licensed the technology to Adden Energy, a Harvard spinoff company cofounded by Li and three Harvard alumni. Adden Energy has scaled up the technology to build a smart phone-sized pouch cell battery.

Electrek’s Take

This is yet another milestone achieved in the solid-state battery saga. The ultimate challenge is still bringing them to mass-production at a lower price than lithium-ion batteries. That will be the real game-changer for EVs.

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Save $500 on Luckeep’s C23 two-seater e-bike at new $499 low, Aventon Aventure 2 e-bike at $1,499 annual low, LG, Schumacher, more

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August 29, 2025

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Save 0 on Luckeep's C23 two-seater e-bike at new 9 low, Aventon Aventure 2 e-bike at ,499 annual low, LG, Schumacher, more

We’re closing out the week’s Green Deals with a jam-packed edition filled with some great savings opportunities through Labor Day weekend. Our headliner is Luckeep’s C23 Folding Step-Through Two-Seater e-bike that has fallen to a new $499 low, with it followed by Aventon’s Aventure 2 All-Terrain e-bike hitting the best price of 2025 at $1,499. There’s also the possible $1,685 savings you can score on LG’s WashCombo All-in-One Electric Ventless Washer/Dryer starting from $2,000, as well as Schumacher’s new portable EV charger at a new low, one of the largest bundles on Lectric’s XPeak2 e-bikes, two DJI power station discounts, EGO’s multi-head combo kit, and more waiting for you below. Plus, all the hangover savings are at the bottom of the page, like yesterday’s first-ever Aventon Soltera 2.5 e-bike discount, the returning low on Autel’s new 80A level 2 EV charging station, and more.

Head below for other New Green Deals we’ve found today and, of course, Electrek’s best EV buying and leasing deals. Also, check out the new Electrek Tesla Shop for the best deals on Tesla accessories.

Review: The ST3 Pro e-scooter brings serious suspension alongside smart controls and more as Navee’s latest flagship

As a long-time rider of Segway electric scooters, my expectations are quite high for new brands looking to climb their way up to the standard that the household-name has set in stone at this point. Only within the last few months did Navee come onto my radar, with the brand offering me the chance to test out its latest flagship model, the ST3 Pro Electric Scooter, which has been quite the surprise, to say the least. At first, it seemed like it was full of gimmicks that were destined to fail, but after riding around for several weeks now, I can happily say that Segway may just have found a new challenger. Head below to get my hands-on impressions of this high-end e-scooter that still retains accessible pricing for the stunning list of features.

To get our full hands-on impression of this new flagship e-scooter, be sure to check out our review here.

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woman riding Luckeep's C23 folding e-bike down street

Save $500 on Luckeep’s C23 folding step-through e-bike with a removable passenger seat at a new $499 low

Luckeep is offering the lowest price yet on its C23 Folding Step-Through Two-Seater e-bike at $499 shipped, after using the promo code LKSDC23250 at checkout, which beats out Amazon’s current pricing by $101. It carries a $999 MSRP directly from the brand, though it’s never gone above $749 at Amazon in the two+ months it’s been listed, which we’ve seen taken down to $600, $569, and $519 in 2025 so far. Taking advantage of this promotional deal, though, gives you more savings than ever, as $500 is cut from the MSRP for the best new price that we have tracked.

Luckeep has designed the C23 Folding e-bike for women in particular, though that’s not to say anyone else can’t enjoy the budget-friendly commuter at this price – especially if you’re going to be regularly using it to shepherd kids to life’s appointments, as it sports a removable mini sofa backseat. What’s more, the folding design makes it far more manageable when storing it after a ride too, only adding to the versatile convenience. It comes equipped with a 750W rear hub motor that peaks as high as 1,200W alongside a 624Wh battery to provide up to 28 MPH top speeds for up to 65 miles of pedal-assisted travel.

Luckeep’s C23 folding e-bike even comes with its own security measures in the form of an NFC card, as well as smartphone or smartwatch apps, which can be used to lock and unlock the bike when you hop off. From there, you’re getting some solid stock features for such an affordable price, like the front suspension lock-out fork, all-terrain tires, an integrated headlight and taillight, and more – including the unique features I’ve already mentioned.

Last week we saw a great deal on Luckeep’s X1 Lite Folding All-Terrain e-bike at $466 too.

woman riding aventon aventure 2 all-terrain e-bike down beach near water
Photo: BLUETTI

Aventon cuts the price further on its Aventure 2 all-terrain e-bikes to best price of 2025 at $1,499

As part of its ongoing Final Summer/Labor Day Sale running through September 3, Aventon has dropped the price further on its Aventure 2 All-Terrain e-bike to $1,499 shipped. It started this sale having fallen from its $1,999 full price to $1,699, with an additional $200 being taken off now for the best price of the year. We’ve seen discounts mostly dropping the costs to $1,599 at best this year, with this being the first time we’ve spied it going further in the last eight months. You’re looking at a total $500 price cut while the sale continues, giving you one of the most popular legacy models from this brand at the best price of 2025 – and it even beats out 2024’s Black Friday and Christmas pricing by $200 too.

If you want to learn more about this model’s capabilities, be sure to check out our original coverage of this deal here.

woman airing out sheet in front of LG WashCombo all-in-one electric ventless washer/dryer

LG’s WashCombo all-in-one electric ventless washer/dryer is getting up to $1,685 in savings for Labor Day starting from $2,000

As part of its ongoing Labor Day appliance sale, LG is offering its WashCombo All-in-One Electric Ventless Washer/Dryer for $2,099 shipped, while adding on several extra savings opportunities (more on those below). It normally goes for $3,300 at full price, with the costs taken down between $2,200 and $2,000 most of 2025 during sales, though we did see it drop to $1,999 back in April and fall as low as $1,800 at Best Buy, where it’s currently priced for $1,999.99 shipped, though it doesn’t come with any bonus savings. While it has fallen as low as $1,500 in past years, you’re still looking at a solid $1,201 markdown that only gets sweeter when considering the extra savings you can obtain.

If you want to learn more about this all-in-one laundry solution, as well as the extra savings, be sure to check out our original coverage of these deals here.

Schumacher's 12A level 1 portable EV charger in trunk of SUV

Prime members can score Schumacher’s new 12A level 1 portable EV charger at a new $116 low

Amazon is offering Prime members a second chance at the best pricing on the new Schumacher SEV1670 12A Level 1 Portable EV Charger at $115.59 shipped. Only having been on the market since the end of May and carrying a $160 full price tag, it didn’t see its first discount until Prime Day when it fell to $128, which remained the lowest we’d seen it fall until today. Now, Prime members can enjoy the best new price we have tracked, which gives you $44 off the going rate and drops things $12 under the previous low.

If you want to learn more about this new portable charging solution, be sure to check out our original coverage of this deal here.

two men having conversation in woods on Lectric XPeak2 all-terrain e-bikes

Head off-road with $434 in free gear on Lectric’s XPeak2 long-range e-bike at $1,699 for Labor Day

As part of its ongoing Labor Day Sale running through the upcoming holiday, Lectric has increased several bundle packages on various EVs, including the XPeak2 Long-Range Off-Road e-bike that is getting $434 in free gear at $1,699 shipped. We’ve mostly been seeing this model get bundles ranging from $316 to $336 over 2025, with the increased package during this sale normally costing you $2,133 in full. Picking up this ride while the sale lasts scores you the additional gear of a rear cargo rack, fenders to go over both tires, an Elite headlight, a suspension seat post, a bottle holder and mounting adapter, a bottle-shaped e-bike lock, and water-resistant pannier bags.

If you want to learn more about this off-road e-bike, be sure to check out our original coverage of this deal here, while you can also browse the full Lectric Labor Day Sale lineup here.

man and woman enjoying nature with DJI Power 1000 power station

Bring DJI’s Power 1000 or 2000 power stations on outdoor adventures starting from $499

Through its official Amazon storefront, DJI is offering its Power 1000 Portable Power Station at $499 shipped. While it carries a $999 MSRP, we’ve been seeing it in 2025 keep down at $699 in full at Amazon. Since the end of July it’s been staying above $549, with past discounts this year having taken the costs as low as $379 in a series of short-term Lightning sales back at the top of the year. You’re looking at a 29% markdown off the going rate here, which saves you $200 while equipping your outdoor adventures with the means to keep your personal devices running.

If you want to learn more about this unit, or its larger counterpart, be sure to check out our original coverage of these deals here.

rearview mirror with VIOFO A119 Mini 2 dash cam attached to windshield

Keep on your budget while getting a watchful companion for the road with VIOFO’s A119 Mini 2 dash cam at $100

By way of its official Amazon storefront, VIOFO is offering its A119 Mini 2 Dash Cam for $99.98 shipped which comes right behind our earlier coverage of the more advanced A229 series of dash cams. This smaller single-cam option usually fetches $139 at full price, which has regularly fallen between $100 and $99 over the course of 2025, with one drop lower to $90 back at the end of March. While we have seen the price go as low as $86 in 2024, you’re otherwise looking at the third-best rate of 2025 that cuts $39 off the going rate while giving you one of the brand’s best budget-friendly dash cam options.

If you want to learn more about this budget-friendly dash cam, be sure to check out our original coverage of this deal here.

man mowing weeds with EGO Power+ string trimmer

Start your EGO multi-head arsenal with a power head, 15-inch string trimmer attachment, and 5.0Ah battery for $320

Amazon is offering the EGO Power+ 56V Multi-Head 15-inch String Trimmer and Power Head Combo Kit with 5.0Ah battery for $319.99 shipped. It normally fetches $389 at full price, which we’ve mostly seen dropping between $350 and $309 in 2025, save for the one-time drop to $264 we spotted back in May. While it’s not the lowest tracked price in its history, you’re still looking at a solid $69 markdown that drops costs just $10 above Prime Day’s pricing. You can also browse the brand’s Amazon storefront here for more attachments to add to your kit’s arsenal.

If you want to learn more about this multi-functional tool, be sure to check out our original coverage of this deal here.

Best Summer EV deals!

Best new Green Deals landing this week

The savings this week are also continuing to a collection of other markdowns. To the same tune as the offers above, these all help you take a more energy-conscious approach to your routine. Winter means you can lock in even better off-season price cuts on electric tools for the lawn while saving on EVs and tons of other gear.

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Honda is offering big discounts on EVs for labor day

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3 hours ago

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August 29, 2025

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Honda is offering big discounts on EVs for labor day

Honda-discounts-EVs

The Honda Prologue is one of the best-selling electric vehicles in the US. For Labor Day, Honda is offering generous discounts on EVs, including the Prologue and Acura ZDX.

What discounts is Honda offering on EVs for Labor Day?

After delivering the first models last March, Honda’s electric SUV proved to be a surprise hit. In the second half of 2024, it was the second-best-selling electric SUV, trailing only the Tesla Model Y.

The Prologue remains a top seller in the US in 2025, outselling the Ford Mustang Mach-E and Hyundai IONIQ 5 last month. With new Labor Day discounts, Honda has made its EVs even more attractive.

Honda is offering 2025 Prologue leases starting at $159 per month. The offer is for 24 months with $1,099 due at signing and includes a $3,500 conquest or loyalty bonus. Although it’s a regional offer, it’s available in most US states.

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Alternatively, you can opt for Honda’s unique One Pay Lease deal. The offer allows you to pay the entire $4,800 lease amount upfront. For a 24-month lease, the monthly cost works out to approximately $200.

Honda-discounts-EVs

This is also a regional offer, available in California and other ZEV states. The One Pay Lease deal ends on September 2, while the $159 monthly lease deal is available until September 30. Both include the $7,500 EV tax credit, set to expire at the end of September.

2025 Honda Prologue trim Starting Price* Starting Price After
Tax Credit*		 EPA Range
(miles)
EX (FWD) $47,400 $39,900 308
EX (AWD) $50,400 $42,900 294
Touring (FWD) $51.700 $44,200 308
Touring (AWD) $54,700 $47,200 294
Elite (AWD) $57,900 $50,400 283
2025 Honda Prologue prices and range by trim (*Does not include $1,450 D&H fee)

Although the Prologue took the spotlight, Honda’s luxury brand, Acura, is selling more EVs than it even expected. Through the first half of the year, the Acura ZDX outsold the Cadillac Lyriq.

The Acura ZDX is available for lease starting at $299 per month, with over $30,000 in lease cash incentives. The offer is for 36 months with $4,699 due at signing.

Honda-discounts-EVs
Acura ZDX at a Tesla Supercharger (Source: Honda)

This is also a regional deal, available in California and other ZEV states. It ends on September 2. Acura is offering 0% APR financing on the 2024 ZDX until September 2. If you’re looking for other EV lease deals for under $300 a month, check out our updated list for August here.

Are you looking to take advantage of the savings while they last? We can help you find the right model at the best price. You can use our links below to find deals on the Honda Prologue and Acura ZDX near you.

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LiveWire slashes prices with extreme sales on electric motorcycles

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3 hours ago

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August 29, 2025

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LiveWire slashes prices with extreme sales on electric motorcycles

If you’ve been eyeing a LiveWire electric motorcycle but couldn’t justify the price tag, this might be your moment. LiveWire Group just launched a new “Twist & Go” promotion that drops prices on its entire S2 lineup by thousands of dollars – at least for a limited time.

From now through October 31, 2025, customers can score significant discounts on all three S2 models:

  • S2 Del Mar: Now starting at $9,999
  • S2 Mulholland: Now starting at $10,999
  • S2 Alpinista: Now starting at $11,999

For reference, those models previously hovered in the $15k – $17k range depending on trim and region, so this is a serious price cut. And it’s not just a one-off model – this covers the full S2 lineup.

LiveWire is also rolling out a free software update that adds two long-awaited features: Reverse mode (a blessing for parking maneuvers on heavier bikes or when trying to back up a slight incline) and Roll-Forward Regenerative Braking, which lets riders engage regen while twisting the throttle forwards.

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Electrek’s Take

This feels like significantly more than just a seasonal promotion. I’d say it’s clearly a response to slower-than-expected sales on what are arguably some of the most refined electric motorcycles on the market… but also some of the priciest. While the S2 Del Mar and its siblings have impressed with solid range, sporty performance, and premium styling, their premium pricing has made it tough to lure buyers away from both cheaper electric options and high-performing gas bikes. And as someone who owns an S2 Del Mar, I can tell you that its a fantastic bike to ride, but the price does make you swallow hard before pulling the trigger (and not owning a car helps, at least for me).

Slashing thousands off the price could help LiveWire move more units heading into the fall, especially as the weather cools and motorcycle sales typically dip. But it also signals that the high-end e-moto market might be hitting a ceiling, at least for now. LiveWire seems to be aware of that as well considering how they’re aggressively targetting smaller and more affordable bikes with their recent developments.

If you’ve been waiting for the right moment to go electric on two wheels, LiveWire just gave you one. But act fast, because the deal ends October 31, and inventory might not last that long.

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