Home » How I Used A Chainsaw To Remove Batteries From The Cheapest EV In The World

How I Used A Chainsaw To Remove Batteries From The Cheapest EV In The World

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I’m typing very awkwardly now because the ring finger on my left hand is swollen with a blackened nail and feels like a baby hippo is gnawing on it with those big, flat hippo molars. It’s throbbing. It hurts. It’s like this because in the messy, brutal process of attempting to remove the old, swollen, failed batteries from my Changli. I crushed the tip of that finger between a mass of three fused-together batteries and a steel bar. It hurt so badly I think I became fluent in Dutch for a moment and maybe ejected a searing hot burst of agony-urine. But it was all worth it, because I eventually was successful in getting the old, trapped batteries out of the little EV, but the process was less like car repair and more like demolition. Ugly, loud, messy, crude. But, you know me, that’s how I roll! Oy.

In case you can’t wait or don’t feel like reading, here’s a little video showing the desperate goings-on:

The Problem

You may recall from my last update about the fantastic Changli, the cheapest new electric car you can buy in the whole wet world, that the five lead-acid batteries that the car was supplied with have failed, and, possibly as a result of overcharging or perhaps freezing temperatures, have all expanded and bloated to such a degree that they have effectively wedged themselves into the Changli’s battery box, firmly pressed against the steel walls of the box, immobile and defiant.

After some vain attempts to get the batteries to budge, I soon realized that these batteries were not going to be willing participants, and I needed to just forget the years of service they gave me, propelling that little Changli all over the place, even doing their best in the potent crucible of the racetrack:

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For these five lead-acid batteries, though, those days were over, and I now needed to view the heavy lumps of lead as adversaries. I took a good hard look at them and made some plans. The first step, of course, is naming your enemy, and the particular circumstances of these batteries helped me do just that:

Batterytriumvirate

Three of the batteries had expanded to the point where they’d fused themselves into one monolithic block: collectively, I named them for the famous First Triumvirate of ancient Rome,  Gaius Julius CaesarGnaeus Pompeius Magnus and Marcus Licinius Crassus. The other two batteries were not fused to the Triumvirate, but were still swollen and trapped; I named these two for anti-Caesarian members of the Senate, Cato and the famous stabbing-betrayer Brutus.

These names should give a clue to the necessary approach to getting these batteries removed from the Changli’s battery box, the Senate of the car (or SPQR), if you will. To make it happen, I need to destroy Julius Caesar.

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Now, in my last post, I got a lot of great suggestions about how to remove the batteries. People suggested the use of straps and hoists, cutting away the steel of the battery box, or perhaps drilling a hole in the bottom and using a floor jack. While these methods may have worked, I decided that I really wanted to avoid cutting the metalwork of the Changli itself.

The batteries are done and useless now. They’re expendable. So, if anything is going to get damaged or destroyed, it should be them, not the Changli, which I want as intact as possible for when I replace the batteries and drive this fine 1.1 horsepower beast again.

The Solution

That’s where the chainsaw comes in. Here, I’ll link the video again so you don’t even need to scroll back up:

The truth is, this turned into a job that was not like car repair; it became a demolition job, just wanton and crude destruction, because the only way anything would move in that battery box was if I was able to actually make available space for motion, and to do that I had to destroy the physical form of at least one of the batteries. And the best choice was Caesar, right there in the middle, locking everything in.

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I didn’t have a Sawzall or anything like that handy, so the chainsaw it was. I just needed to break the integrity of the battery – physical integrity, as I’m sure morally this battery collapsed long ago – and the chainsaw did a decent job tearing through the plastic housing and churning up the internal plates and dried-up chemicals, which resembled a lot of potting soil, into a powder that could be re-distributed around the battery box, creating space for me to maneuver the other batteries free.

Have you ever chainsawed through a lead-acid battery? It feels very strange. The consistency of the battery material is dense and soil-like, punctuated with the kick of plastic panels or metal webbing. Smells funny, too. Funny in the equivalent-to-huffing-a-plastic-bag-of-RoundUp kind of way, not the ha-ha kind of way.

Smashedbattery

After the first round of chainsawing, followed by some careful and precise whaling-upons with a hammer, I was able to break Caesar down enough to the point where I could get Brutus angled enough to be freed from the trap of the outer steel lip of the battery box, and from there I was able to pry-bar it onto its end, and lift it out.

Prybarbruts

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Elated with my small victory, I snorted a fat rail of lead-acid dust, to be sure my mental capacity was impaired enough to continue. It very much was.

From this point on, it was just a fight. An ugly, unpleasant fight with hammers and crowbars, with casualties on both sides. I got Cato out, leaving the three fused-together Triumvirate batteries. An attempt to get them out as one monolith failed, resulting in the smashing of my finger between the batteries and the wall of the battery box, and my finger still fucking hurts.

Finger Battery

Livid, I decided that the Triumvirate had dictated the terms of my life for far too long, so I used another prybar and a hammer to separate Pompey from the group, which finally allowed me the room and freedom I needed to drag the demoralized remaining one-and-a-half members of the former Triumvirate out of the battery box, permanently.

Batteries Tomato

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There you can see the sorry state of the batteries after I finally got them out. Caesar is half destroyed, but still fused to Crassus. Pompey has some hammer damage, and Brutus and Cato are just horribly bloated and swollen.

I’m also putting a picture of my cat Tomato here, as a way to make up for the gross finger and diseased battery pictures. Tomato watched me the whole time, baffled. That’s healthy.

I’m hoping a battery expert may be able to tell me if the visual condition of the battery internals can give a clue as to how and why these batteries failed; was it overcharging, or damage from freezing, or just age? If I end up going back to lead-acids, how can I avoid the same fate? [Ed note: I’m guessing there was some kind of internal short, maybe a result of high humidity/moisture. -DT]. 

Emptybatterybox

I’m just happy to have those old batteries out; a tumor has been excised, and I can now start fresh. But what batteries should I put in? I could just get five lead-acid car batteries, but are those going to work as well as the more small electric vehicle-specific lead-acids I had in here before? What is the difference? Can I get batteries with more amp-hours and expect more range? Will regular car batteries tolerate all the charge/discharge cycles or will I need deep-cycle marine batteries or something?

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What about a salvaged NiCad pack from a hybrid like a Prius? Or, hell, even a Lithium-Ion pack? But those are crazy expensive, and I’d likely need new charging electronics, too? The point is, I have a lot of research to do, and any input is appreciated. I’ll try and find some experts to consult, and perhaps I’ll start with new lead-acids and then move to something more exotic? I’m not sure yet.

What I am sure of is that I’m excited to get the Changli going again, better than ever, and I never, ever want to have to do this sort of battery extraction job. What a shitshow.

 

Relatedbar

How Wildly Swollen Batteries Have Derailed My Plans To Resurrect The Cheapest Car In The World

The Cheapest Car In The World (The Changli) Is Broken And I’m Stumped

Changli Update: The Cheapest Electric Car In The World Is Still Fantastic But Has One Annoying And Confusing Problem

How My Changli Inspired A Man To Start Selling Cheap, Low-Speed, Street-Legal EVs In The U.S.

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Scott
Scott
1 month ago

I know Monday-morning quarterbacks are a dime a dozen, but I think that using a drill with a big bit to turn the batteries into Swiss cheese might have been a little easier/less messy than the chainsaw. Same idea though.

If you move back to LA and have to do this again sometime in the future, message me and I’ll bring my Bosch rotary hammer over. It’s got those SDS bits that don’t rotate in the chuck and enough torque to break a wrist. 🙂

Joepian
Joepian
1 month ago

My 2 cents – put a Predator 212 gasoline engine in there and mate it to a generator. Wire the generator to Changli’s nervous system and voila`…back on the road again!

hugh crawford
hugh crawford
1 month ago

Aww, I mistakenly thought this was about swapping a chainsaw in to replace the electric motor. Silly sensible me.

AkioOhtori
AkioOhtori
1 month ago

My partner is currently working on a project involving LiFePO4 (Lithium Iron Phosphate) batteries which seem like they’re pretty awesome compared to Lead Acid, having no issues being drained to 0%, and less problematic then Lithium Ion batteries as they contain no cobalt and other metals typically mined with slavery. That said, five of even the medium sized ones would quickly eclipse the cost of the entire vehicle, so I’m pretty sure they’d be a pass for this project. Though maybe you could get a manufacturer to throw you a couple (or 5) review samples?

Sgtyukon
Sgtyukon
1 month ago

When it was all over, you did call a hazmat team, I hope.

2006C5citroen-Berlingo
2006C5citroen-Berlingo
1 month ago

1 Kg weight 12 volt li-ion batteries sold for European microlight aircraft. Sure you can rig them for the volts and amps you need, and the chargers are found everywhere, with no worries about ghost memory and so on. People swear by them.

thatmiataguy
thatmiataguy
1 month ago

For gosh sakes, this was preferable to cutting the metal box the batteries were in???

Not that I expect this kind of logic to be in play here, but I would never almost purposely damage my health this much to save a metal box inside a Chinese electric car.

415s30
415s30
1 month ago

This is entertaining but nobody should buy this garbage.

Brooks
Brooks
1 month ago

Lithium Iron Phosphate if I understand it, can only 4 can chained together for a 48volt system if you buy the 12v batteries, so that will not be the route to go.
If going with Lifepo4, you can peruse Aliexpress and find 60v-60ah batteries with chargers for what 5 lead acid batteries would cost you. Of course the wait time from Aliexpress may be a sticking point as a lot of times it takes awhile to get stuff from China.

TxJeepGuy
TxJeepGuy
1 month ago

You should call Optima and see if they still do the “Adoptimas” that Roadkill would get for free.

Tbe30ll
Tbe30ll
1 month ago

you can absolutely get some deals on a better battery or batteries for this beautiful automobile. I personally like https://batteryhookup.com/

Clark B
Clark B
1 month ago

A crushed fingernail is one of my least favorite injuries (I mean, outside something catastrophic involving stitches or broken bones or reattachment). Yeah it stops hurting after a while, but then you’ve got a black fingernail that starts chipping away after a while and it takes a couple MONTHS for it to fully heal.

Dave_Hudson
Dave_Hudson
1 month ago

More of this, Torch. I mean it. More dumb stuff from you and David. It’s what I’ve been missing.

Nicholas Fuller
Nicholas Fuller
1 month ago

wait, did you not even wear a mask?

Nicholas Fuller
Nicholas Fuller
1 month ago

“..link the video so you don’t even need to scroll back up..” made me shockingly happy

Phonebem
Phonebem
1 month ago

I get the feeling I just watchd Torch become the David Tracey of EVs…

Joepian
Joepian
1 month ago
Reply to  Phonebem

and now that DT has an i3, they can tag-team stupidness their creative ways to destroy and reconstruct. Shocking, I know!

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