@pengwengsrcool.bsky.social
The best products are engineered at the mercy of design limitations and clever ways to utilize components and materials in the best way possible.
The Index 01 could be thinner, lighter, safer and wirelessly rechargeable with a rechargeable LFP cell.
So in this instance, we can have everything.
The Index 01 could be thinner, lighter, safer and wirelessly rechargeable with a rechargeable LFP cell.
So in this instance, we can have everything.
December 11, 2025 at 1:05 AM
The best products are engineered at the mercy of design limitations and clever ways to utilize components and materials in the best way possible.
The Index 01 could be thinner, lighter, safer and wirelessly rechargeable with a rechargeable LFP cell.
So in this instance, we can have everything.
The Index 01 could be thinner, lighter, safer and wirelessly rechargeable with a rechargeable LFP cell.
So in this instance, we can have everything.
It should still be sustainable in other ways. It matters.
And there are easy ways to address this in the Index 01.
And there are easy ways to address this in the Index 01.
December 11, 2025 at 12:59 AM
It should still be sustainable in other ways. It matters.
And there are easy ways to address this in the Index 01.
And there are easy ways to address this in the Index 01.
4.7g multiplied by how many per year or per two years? 🙂
The manufacturing of all the material, components etc. matters too.
It adds up.
We already, as a human species, are well past "reasonable" when it comes to waste and pollution. And there are not even good reasons to make this disposable. 🫤
The manufacturing of all the material, components etc. matters too.
It adds up.
We already, as a human species, are well past "reasonable" when it comes to waste and pollution. And there are not even good reasons to make this disposable. 🫤
December 11, 2025 at 12:56 AM
4.7g multiplied by how many per year or per two years? 🙂
The manufacturing of all the material, components etc. matters too.
It adds up.
We already, as a human species, are well past "reasonable" when it comes to waste and pollution. And there are not even good reasons to make this disposable. 🫤
The manufacturing of all the material, components etc. matters too.
It adds up.
We already, as a human species, are well past "reasonable" when it comes to waste and pollution. And there are not even good reasons to make this disposable. 🫤
Eric is right about the device's merit, but (imo) not in the way it was designed.
It's efficient, but has to be with a single-use battery. The equation woulf be different when a smaller lithium cell could last for 6 months to 1 year and charge via Qi2 (place it on your phone to charge).
It's efficient, but has to be with a single-use battery. The equation woulf be different when a smaller lithium cell could last for 6 months to 1 year and charge via Qi2 (place it on your phone to charge).
December 11, 2025 at 12:52 AM
Eric is right about the device's merit, but (imo) not in the way it was designed.
It's efficient, but has to be with a single-use battery. The equation woulf be different when a smaller lithium cell could last for 6 months to 1 year and charge via Qi2 (place it on your phone to charge).
It's efficient, but has to be with a single-use battery. The equation woulf be different when a smaller lithium cell could last for 6 months to 1 year and charge via Qi2 (place it on your phone to charge).
Make it charge wirelessly (Qi2). No charge adapter needed.
And also, why just assume people will lose the adapter? Besides, manufacturing an entirely new ring is FAR WORSE than just producing a new adapter (IF someone lose it and IF it has no Qi2 charging).
Put LFP in it, make it charge via Qi2. 🤷♂️
And also, why just assume people will lose the adapter? Besides, manufacturing an entirely new ring is FAR WORSE than just producing a new adapter (IF someone lose it and IF it has no Qi2 charging).
Put LFP in it, make it charge via Qi2. 🤷♂️
December 11, 2025 at 12:47 AM
Make it charge wirelessly (Qi2). No charge adapter needed.
And also, why just assume people will lose the adapter? Besides, manufacturing an entirely new ring is FAR WORSE than just producing a new adapter (IF someone lose it and IF it has no Qi2 charging).
Put LFP in it, make it charge via Qi2. 🤷♂️
And also, why just assume people will lose the adapter? Besides, manufacturing an entirely new ring is FAR WORSE than just producing a new adapter (IF someone lose it and IF it has no Qi2 charging).
Put LFP in it, make it charge via Qi2. 🤷♂️
He was commenting in regards to the new ring (Index 01). Is the ring repairable? Can we replace the cell?
You will have many opportunities to expand on this idea and make an Index 02 with more functionality, so I don't assume you do this to make more money. But still the wrong design choice, imo.
You will have many opportunities to expand on this idea and make an Index 02 with more functionality, so I don't assume you do this to make more money. But still the wrong design choice, imo.
December 11, 2025 at 12:43 AM
He was commenting in regards to the new ring (Index 01). Is the ring repairable? Can we replace the cell?
You will have many opportunities to expand on this idea and make an Index 02 with more functionality, so I don't assume you do this to make more money. But still the wrong design choice, imo.
You will have many opportunities to expand on this idea and make an Index 02 with more functionality, so I don't assume you do this to make more money. But still the wrong design choice, imo.
Please look into what people are saying. 🫤
The facts are:
- You could make it safer with LFP (a lithium chemistry safer than silver-oxide)
- More compact (1 year rechargeable battery life)
- Lighter (Wh/g is low on silver-oxide)
- Wireless charging (no adapter to lose)
- No need for disposable tech
The facts are:
- You could make it safer with LFP (a lithium chemistry safer than silver-oxide)
- More compact (1 year rechargeable battery life)
- Lighter (Wh/g is low on silver-oxide)
- Wireless charging (no adapter to lose)
- No need for disposable tech
December 11, 2025 at 12:36 AM
Please look into what people are saying. 🫤
The facts are:
- You could make it safer with LFP (a lithium chemistry safer than silver-oxide)
- More compact (1 year rechargeable battery life)
- Lighter (Wh/g is low on silver-oxide)
- Wireless charging (no adapter to lose)
- No need for disposable tech
The facts are:
- You could make it safer with LFP (a lithium chemistry safer than silver-oxide)
- More compact (1 year rechargeable battery life)
- Lighter (Wh/g is low on silver-oxide)
- Wireless charging (no adapter to lose)
- No need for disposable tech
Same size lithium cell would last 1 year (if the silver-oxide lasts for 2 years). I might even be understating the lithium battery life because pouch cells have potentially much better Wh/L than cylindrical cells.
It could be thinner and lighter (incl. charge circuit etc.) and >6 month battery.
It could be thinner and lighter (incl. charge circuit etc.) and >6 month battery.
December 11, 2025 at 12:30 AM
Same size lithium cell would last 1 year (if the silver-oxide lasts for 2 years). I might even be understating the lithium battery life because pouch cells have potentially much better Wh/L than cylindrical cells.
It could be thinner and lighter (incl. charge circuit etc.) and >6 month battery.
It could be thinner and lighter (incl. charge circuit etc.) and >6 month battery.
Easily solved by just using an LFP (LiFePo₄) cell. They are safe. Don't generalize all lithium cells
Even if you use NMC chemistry, you can make it fail in a safe way by making the inner part of the ring in steel, and design the failure mode such that the battery would expand outwards, not inwards.
Even if you use NMC chemistry, you can make it fail in a safe way by making the inner part of the ring in steel, and design the failure mode such that the battery would expand outwards, not inwards.
December 11, 2025 at 12:24 AM
Easily solved by just using an LFP (LiFePo₄) cell. They are safe. Don't generalize all lithium cells
Even if you use NMC chemistry, you can make it fail in a safe way by making the inner part of the ring in steel, and design the failure mode such that the battery would expand outwards, not inwards.
Even if you use NMC chemistry, you can make it fail in a safe way by making the inner part of the ring in steel, and design the failure mode such that the battery would expand outwards, not inwards.
It's about both!
Potentially replacing a tiny rcharging adapter (that is IF you lose it), is better than havikg to buy an entirely new manufactured ring with steel, PCB, electronics, battery, silicone etc.
Many people won't lose it. AND you can make it charge wirelessly! No dongle needed!
Potentially replacing a tiny rcharging adapter (that is IF you lose it), is better than havikg to buy an entirely new manufactured ring with steel, PCB, electronics, battery, silicone etc.
Many people won't lose it. AND you can make it charge wirelessly! No dongle needed!
December 11, 2025 at 12:18 AM
It's about both!
Potentially replacing a tiny rcharging adapter (that is IF you lose it), is better than havikg to buy an entirely new manufactured ring with steel, PCB, electronics, battery, silicone etc.
Many people won't lose it. AND you can make it charge wirelessly! No dongle needed!
Potentially replacing a tiny rcharging adapter (that is IF you lose it), is better than havikg to buy an entirely new manufactured ring with steel, PCB, electronics, battery, silicone etc.
Many people won't lose it. AND you can make it charge wirelessly! No dongle needed!
No, not exactly. 🫤 It was including the weight of charging ICs and pins/coils.
Lithium cells have double the Wh/gram. And you can even halve the capacity (making it 1/4th the silver-oxide capacity) and have 6 months battery use and charging.
Easily making it thinner AND lighter AND rechargeable.
Lithium cells have double the Wh/gram. And you can even halve the capacity (making it 1/4th the silver-oxide capacity) and have 6 months battery use and charging.
Easily making it thinner AND lighter AND rechargeable.
December 11, 2025 at 12:12 AM
No, not exactly. 🫤 It was including the weight of charging ICs and pins/coils.
Lithium cells have double the Wh/gram. And you can even halve the capacity (making it 1/4th the silver-oxide capacity) and have 6 months battery use and charging.
Easily making it thinner AND lighter AND rechargeable.
Lithium cells have double the Wh/gram. And you can even halve the capacity (making it 1/4th the silver-oxide capacity) and have 6 months battery use and charging.
Easily making it thinner AND lighter AND rechargeable.
No but it will die on you after the battery is depleated and you hve to constanrlt rebuy it. 🫤
As for the "no subscription", that's unecessary and a given in my opinion.
But the fact that you need to constantly rebuy it makes it a de facto "subscription". A consumable.
As for the "no subscription", that's unecessary and a given in my opinion.
But the fact that you need to constantly rebuy it makes it a de facto "subscription". A consumable.
December 11, 2025 at 12:07 AM
No but it will die on you after the battery is depleated and you hve to constanrlt rebuy it. 🫤
As for the "no subscription", that's unecessary and a given in my opinion.
But the fact that you need to constantly rebuy it makes it a de facto "subscription". A consumable.
As for the "no subscription", that's unecessary and a given in my opinion.
But the fact that you need to constantly rebuy it makes it a de facto "subscription". A consumable.
But it's easily avoidable by foing with a lithium chemistry that is SAFER than silver-oxide!
Lithium Ion isn't the chemistey, it's a huge umbrella of a diverse range of chemistries.
LFP (LiFePo₄) is safe a considerably safer than silver-oxide. If you want safety, that's what you want.
Lithium Ion isn't the chemistey, it's a huge umbrella of a diverse range of chemistries.
LFP (LiFePo₄) is safe a considerably safer than silver-oxide. If you want safety, that's what you want.
December 11, 2025 at 12:04 AM
But it's easily avoidable by foing with a lithium chemistry that is SAFER than silver-oxide!
Lithium Ion isn't the chemistey, it's a huge umbrella of a diverse range of chemistries.
LFP (LiFePo₄) is safe a considerably safer than silver-oxide. If you want safety, that's what you want.
Lithium Ion isn't the chemistey, it's a huge umbrella of a diverse range of chemistries.
LFP (LiFePo₄) is safe a considerably safer than silver-oxide. If you want safety, that's what you want.
Calling critique for negativity doesn't mean it has no merit. 😉 You even say you "take no notice" and "ordered on the spot".
What you're essentially saying here is that you block your ears and don't listen because you already decided what your view is gonna be. 🤷♂️
What you're essentially saying here is that you block your ears and don't listen because you already decided what your view is gonna be. 🤷♂️
December 11, 2025 at 12:01 AM
Calling critique for negativity doesn't mean it has no merit. 😉 You even say you "take no notice" and "ordered on the spot".
What you're essentially saying here is that you block your ears and don't listen because you already decided what your view is gonna be. 🤷♂️
What you're essentially saying here is that you block your ears and don't listen because you already decided what your view is gonna be. 🤷♂️
But is it worth $75 plus shipping and import VAT (>100) and then $99 plus shipping and import VAT (>125) every couple years or even every year?
When it could've just been thinner and lighter AND rechargeable and last 6 months or a year instead (and then you just charge it)?
When it could've just been thinner and lighter AND rechargeable and last 6 months or a year instead (and then you just charge it)?
December 10, 2025 at 11:57 PM
But is it worth $75 plus shipping and import VAT (>100) and then $99 plus shipping and import VAT (>125) every couple years or even every year?
When it could've just been thinner and lighter AND rechargeable and last 6 months or a year instead (and then you just charge it)?
When it could've just been thinner and lighter AND rechargeable and last 6 months or a year instead (and then you just charge it)?
The problem with that statement is that it csn be thinner and lighter with a rechargeable battery. 🫤 So it's not really a trade-off, it's just making the profuct worse and less sustainable without good reason.
December 10, 2025 at 11:52 PM
The problem with that statement is that it csn be thinner and lighter with a rechargeable battery. 🫤 So it's not really a trade-off, it's just making the profuct worse and less sustainable without good reason.
Besides, this is a low amount of energy we're talking. So even if it's not LFP, I wouldn't be worried. If they source quality cells and don't over-charge them, it's unlikely to have any safety implications. If the ring is designed right, I don't see how it could swell such that you cannot remove it.
December 9, 2025 at 7:30 PM
Besides, this is a low amount of energy we're talking. So even if it's not LFP, I wouldn't be worried. If they source quality cells and don't over-charge them, it's unlikely to have any safety implications. If the ring is designed right, I don't see how it could swell such that you cannot remove it.
Lithium cell safety is tied to stuff like top-off voltage, e.g. NMC. LFP is so safe you can even physically attack the bare cell without it catching fire or exploding.
LFP/LiFePo₄ is a chemistry. It is both mature and super safe. Nominal voltage of 3.2 V, very flat discharge curve, high efficiency.
LFP/LiFePo₄ is a chemistry. It is both mature and super safe. Nominal voltage of 3.2 V, very flat discharge curve, high efficiency.
December 9, 2025 at 7:17 PM
Lithium cell safety is tied to stuff like top-off voltage, e.g. NMC. LFP is so safe you can even physically attack the bare cell without it catching fire or exploding.
LFP/LiFePo₄ is a chemistry. It is both mature and super safe. Nominal voltage of 3.2 V, very flat discharge curve, high efficiency.
LFP/LiFePo₄ is a chemistry. It is both mature and super safe. Nominal voltage of 3.2 V, very flat discharge curve, high efficiency.
Char lim on Bsky. 🫤
No, lithium is double the Wh per gram. So incl. charge
Lithium is safer than silver-oxide if LFP (LifePo₄). LFP has some lowered stats, but still quite good.
Actually, with pouch (not cylindrical), li-ion have better metrics. So maybe I even grossly understated li-ion metrics.
No, lithium is double the Wh per gram. So incl. charge
Lithium is safer than silver-oxide if LFP (LifePo₄). LFP has some lowered stats, but still quite good.
Actually, with pouch (not cylindrical), li-ion have better metrics. So maybe I even grossly understated li-ion metrics.
December 9, 2025 at 7:12 PM
Char lim on Bsky. 🫤
No, lithium is double the Wh per gram. So incl. charge
Lithium is safer than silver-oxide if LFP (LifePo₄). LFP has some lowered stats, but still quite good.
Actually, with pouch (not cylindrical), li-ion have better metrics. So maybe I even grossly understated li-ion metrics.
No, lithium is double the Wh per gram. So incl. charge
Lithium is safer than silver-oxide if LFP (LifePo₄). LFP has some lowered stats, but still quite good.
Actually, with pouch (not cylindrical), li-ion have better metrics. So maybe I even grossly understated li-ion metrics.
🫤 It has a non-regargeable 1.6 V silver-oxide battery cell. Once depleted, it dies.
Silver-oxide cells seem to have double the Wh/L and only half the Wh/g. So same volumetric size lithium cell would last 1 year, but be rechargeable.
Smaller lithium cell would last 6 months. Smaller + lighter ring.
Silver-oxide cells seem to have double the Wh/L and only half the Wh/g. So same volumetric size lithium cell would last 1 year, but be rechargeable.
Smaller lithium cell would last 6 months. Smaller + lighter ring.
December 9, 2025 at 6:48 PM
🫤 It has a non-regargeable 1.6 V silver-oxide battery cell. Once depleted, it dies.
Silver-oxide cells seem to have double the Wh/L and only half the Wh/g. So same volumetric size lithium cell would last 1 year, but be rechargeable.
Smaller lithium cell would last 6 months. Smaller + lighter ring.
Silver-oxide cells seem to have double the Wh/L and only half the Wh/g. So same volumetric size lithium cell would last 1 year, but be rechargeable.
Smaller lithium cell would last 6 months. Smaller + lighter ring.
I think they could fit a battery in the ring "rim" and still have it last 6 months.
I suspect the cell is fitted at the top (under the clicky button & PCB) of the ring, as the dimensions of it aligns with available silver-oxide cell dimensions. Too large in the ring, perfect fit in the click box.
I suspect the cell is fitted at the top (under the clicky button & PCB) of the ring, as the dimensions of it aligns with available silver-oxide cell dimensions. Too large in the ring, perfect fit in the click box.
December 9, 2025 at 6:39 PM
I think they could fit a battery in the ring "rim" and still have it last 6 months.
I suspect the cell is fitted at the top (under the clicky button & PCB) of the ring, as the dimensions of it aligns with available silver-oxide cell dimensions. Too large in the ring, perfect fit in the click box.
I suspect the cell is fitted at the top (under the clicky button & PCB) of the ring, as the dimensions of it aligns with available silver-oxide cell dimensions. Too large in the ring, perfect fit in the click box.
Meaning, it could be the same size and same weight with 1 year usage. For 6 months usage, it could be smaller and lighter.
Lithium: (more than) double the voltage, half the current, 1/4th the voltage drop (= efficiency gains).
So, smaller, lighter, sustainable. Extra components are dirt cheap.
Lithium: (more than) double the voltage, half the current, 1/4th the voltage drop (= efficiency gains).
So, smaller, lighter, sustainable. Extra components are dirt cheap.
December 9, 2025 at 6:31 PM
Meaning, it could be the same size and same weight with 1 year usage. For 6 months usage, it could be smaller and lighter.
Lithium: (more than) double the voltage, half the current, 1/4th the voltage drop (= efficiency gains).
So, smaller, lighter, sustainable. Extra components are dirt cheap.
Lithium: (more than) double the voltage, half the current, 1/4th the voltage drop (= efficiency gains).
So, smaller, lighter, sustainable. Extra components are dirt cheap.
🙂 If this one lasts 2 years, same size rechargeable cell would last 1 year. Silver-oxide cells seem to have double the Wh/L and half the Wh/g compared to li-ion.
There are smart rings lasting a week with HR sensors, step tracking etc. Some even have screens. And they cost way less ($20-$60). 🙃
There are smart rings lasting a week with HR sensors, step tracking etc. Some even have screens. And they cost way less ($20-$60). 🙃
December 9, 2025 at 6:25 PM
🙂 If this one lasts 2 years, same size rechargeable cell would last 1 year. Silver-oxide cells seem to have double the Wh/L and half the Wh/g compared to li-ion.
There are smart rings lasting a week with HR sensors, step tracking etc. Some even have screens. And they cost way less ($20-$60). 🙃
There are smart rings lasting a week with HR sensors, step tracking etc. Some even have screens. And they cost way less ($20-$60). 🙃
I agree. Charging is trivial. It has a one-use battery, but small li-ions cost nothing. Wireless charging (Qi2) would be universal (if the diameter is large enough).
$20 smart rings have rechargeable battery and health sensors. This is way simpler than that and have an MSRP of $99. Disposable tech.
$20 smart rings have rechargeable battery and health sensors. This is way simpler than that and have an MSRP of $99. Disposable tech.
December 9, 2025 at 5:12 PM
I agree. Charging is trivial. It has a one-use battery, but small li-ions cost nothing. Wireless charging (Qi2) would be universal (if the diameter is large enough).
$20 smart rings have rechargeable battery and health sensors. This is way simpler than that and have an MSRP of $99. Disposable tech.
$20 smart rings have rechargeable battery and health sensors. This is way simpler than that and have an MSRP of $99. Disposable tech.
1. My guess is yes, but if the silicone overmold seal fails, then you might get water intrusion. It might be further sealed inside, though. Erics seems to wear it all the time and want it to woek in the shower. But with 30 day warranty you have no guarantee.
2. Info page says "up to 5 min" storage.
2. Info page says "up to 5 min" storage.
December 9, 2025 at 4:57 PM
1. My guess is yes, but if the silicone overmold seal fails, then you might get water intrusion. It might be further sealed inside, though. Erics seems to wear it all the time and want it to woek in the shower. But with 30 day warranty you have no guarantee.
2. Info page says "up to 5 min" storage.
2. Info page says "up to 5 min" storage.