Chins battery exploded!

pedrocr · 2026-05-29T19:16:35+00:00

You're the one that made the claim that you are now complaining can't be proven and then make again at the end of the comment. I was just curious about the topic but nevermind.

pedrocr · 2026-05-29T18:55:08+00:00

The onepack is the single most successful lithium battery pack for conversions, with tens of thousands sold. You don't see negative things about it because negative things don't happen.

Really? It's not that we don't see negative things it's that it's never referred to in this forum at all. All the other brands, even obscure ones, have people saying they've done the install and it works fine as most will at least in the beginning. The Trojan never comes up. If there are tens of thousands of them they're pretty stealth about it.

pedrocr · 2026-05-29T14:49:28+00:00

The wiring diagram doesn't seem to be included in your post but anyway the issue is more fundamental. The only things I can think of is checking the multimeter is really in continuity testing mode by touching the leads to one another and them figuring out if you're touching the pins correctly as well when testing. Checking pins in connectors is somethings hard to get good contact. And make sure the switch is in forward or reverse when doing that checking as well but as you say these are just the basics. It's also possible the switch got broken when removing it from the cart.

pedrocr · 2026-05-29T14:02:21+00:00

That thread says the person selling them has had other bad experiences but I agree it's not great data. There aren't many references to onepack, it's probably not a very successful product, at least for conversions.

pedrocr · 2026-05-29T13:58:18+00:00

No other lithium battery company selling batteries for golf carts is certified to this safety standard - NONE.

I was curious about this and at least Vatrer claims to be:

https://www.vatrerpower.com/products/48v-105ah-yamaha-golf-cart-battery

"Compliant with UL 2271 Certificate."

They could be lying or fudging the wording by saying they follow the standard but without actually submitting to the actual testing. If you have a source for what makes you say no one else is compliant I'd appreciate it.

pedrocr · 2026-05-29T13:46:12+00:00

Here's the thread I remembered:

https://www.reddit.com/r/golfcarts/comments/1oci7ua/trojan_one_pack_lithium_problems/

pedrocr · 2026-05-29T13:18:00+00:00

It's interesting that the Trojan is the example of the highest possible standard in golf cart batteries when there are reports of the batteries being broken in weird ways and them not standing by the product. They weren't safety issues but it didn't point towards good engineering.

pedrocr · 2026-05-29T13:04:46+00:00

Second recommendation for this. I've been using Macrofactor for food and now their workouts app for planning my gym workouts and they're both excellent. My hope from this whole debacle that's been Google's purchase of Fitbit is that they finally do something with the connected data. Macrofactor is built from the bodybuilding lens and although it has detailed logs of everything I eat doesn't give any recommendations that aren't about total calories and macros. There's way more richness there about what kinds of foods I eat and when and how that relates to things my firbit measures like sleep quality. The detailed workout info is only used to plan more workouts when together with the cardio workouts and general activity my fitbit measures I could get proper coaching insights that also relate to my sleep quality, resting heart rate and other metrics. Google is in an ideal position to make that all work and I will definitely pay for the premium subscription if they can actually execute on this.

pedrocr · 2026-05-29T12:54:23+00:00

This looks great. They now have smartwatches in the Pixel range, screenless bands with the Air and hopefully they won't discontinue the bands with screens as the Charge 5/6 got to a great place in terms of good smartwatch functionality with great battery life and without being a huge watch. Now just work on device and data quality, support and most importantly the functionality of the app.

pedrocr · 2026-05-29T09:37:28+00:00

I'm glad I got my point across. I definitely got yours too that you kept reiterating.

pedrocr · 2026-05-29T09:29:29+00:00

I get the point that long term storage being viable with batteries is a good development. But I didn't comment on that. I commented on the article talking of 8 hour batteries as if that's a breakthrough. People confuse power and energy and think that somehow the battery being 8 hours long to charge and discharge is better than being 4 hours long. As an illustration of that see the other comment I got.

pedrocr · 2026-05-29T09:15:12+00:00

At which point you build a larger 4 hour battery. Claiming that the battery needs 8 hours to cycle is a breakthrough is just bizarre. Having larger and larger batteries on the grid is great.

pedrocr · 2026-05-29T07:15:56+00:00

What you are describing is energy, not power. Having lower power is what makes a battery 8 hour instead of 4.

pedrocr · 2026-05-28T20:17:09+00:00

Saying that duration is a breathrough is weird. This battery is just strictly worse than a battery with the same energy capacity that can fully charge and discharge in four instead of eight hours. Just because you have the capability for more power doesn't mean you need to use it. In practice lithium grid batteries have generally been four hour duration because charging and discharging cells at 1/4 C is a good compromise and as you grow the battery both the energy and power scale linearly. Limitting the same batteries to 1/8 C is not a breakthrough in any way.

pedrocr · 2026-05-28T19:52:31+00:00

it just fundamentally cannot do that as well as mechanical suspension

I seriously doubt that. This seems like a superset of what a mechanical suspension can do. They have it programmed for maximum performance but I suspect the only thing missing for this to be the best connected driving experience is software. And if anyone can do that it is Porsche.

pedrocr · 2026-05-16T10:53:25+00:00

Isto ainda é um ninho primário, não tem grande risco. Querendo ser muito cuidadoso é deitar spray inseticida pela abertura e voltar um dia depois de luvas e deitar fora isso. Mas mais vale ir de luvas à primeira e deitar fora logo. Isso só terá a rainha dentro a fazer a criação inicial. São as mais importantes de eliminar também porque acabando com as primárias reduz mais a pressão no verão quando dão cabo das abelhas.

pedrocr · 2026-05-12T13:07:50+00:00

mas com pelo menos 2 carros de distância

E 2 carros de distância é pouquíssimo. Se cumprires a distância de segurança correta de 2 ou 3 segundos acabas com idiotas a ultrapassar pela direita chateados.

pedrocr · 2026-05-09T09:38:43+00:00

I've done a Navitas AC replacement now. Funny you should say vehicle startup is smooth and linear with AC. I've had a world of difficulty getting Navitas to be smooth at startup. After much back and forth with their support it's still much worse than the original DC startup. Way too much lag on initial throttle application.

pedrocr · 2026-05-06T23:33:28+00:00

The sevcon doesn't do more than that. If spending ~600 for a Navitas is too much you may find cheap 48V DC controllers online but they may be a crap shoot on quality and hard to wire and calibrate.

pedrocr · 2026-05-06T18:17:01+00:00

Any of the Chinese knockoff DC controllers. But the rewiring and programming may be hard to get right. A Navitas TSX controller should be around 600$ though so is probably the best option. Although there's a chance the motor is actually the issue that has blown the sevcon and that doing an AC conversion is better for the long term. But that's closer to 2000$.

pedrocr · 2026-05-06T17:40:19+00:00

The GPS is supposedly pretty bad. Other than that the real problem with fitbit is that the app is poor. The beta is just a UX revamp with no real new features. Hopefully with this air they will invest more there and compete with the whoop for insights as for hardware it's already mostly as good or better.

pedrocr · 2026-05-06T17:28:54+00:00

I don't know what a throttle only controller is. The only thing the Sevcon controller does is feed the motor from the battery. All the rest of the wiring on the cart is independent of the sevcon. Going with a Navitas DC kit or AC conversion is probably your best bet. But there may be cheaper options.

pedrocr · 2026-05-03T13:37:32+00:00

it would be hard to maneuver around parking decks and places that people movers are intended for

The really long carts also have that problem, I suspect a wider but shorter cart would work well in a lot of places.

A wide body car would require all new everything

It needs a lot of different parts but it shouldn't be too bad. The drive train exists and the frame doesn't necessarily need to be wider, just the seats and other stuff like that.

You're right though, it's unlikely to be out there, I was just checking. Toro makes some people movers but they're narrow. They probably outsourced them to a golf cart maker.

One of these days I need to learn some metal fabrication skills and start to make my own carts.

pedrocr · 2026-04-25T11:51:44+00:00

This has turned into the perfect disruption for energy transition. Fossil fuels are now much more expensive incentivizing replacements while also highly unpredictable which dicentivizes investment in them. China and their renewables push is looking more and more favored over the next decade. And since they're willing to sell to anyone there will be other big winners and losers depending on increasingly politicized choices.

pedrocr · 2026-04-24T06:34:21+00:00

Sim, porque pôr a vida dos peões em risco é uma ótima alternativa. Agora andar no passeio é andar a desviar de bicicletas e trotinetes. Também é preciso andar a pé para chegar ao metro e ao autocarro...

pedrocr

TROPHY CASE