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I tried to figure out what this is about. Lead-acid battery perhaps, only needs some water sometimes. Those batteries suck, because 1)lead and 2)acid. Also the

I tried to figure out what this is about. Lead-acid battery perhaps, only needs some water sometimes. Those batteries suck, because 1)lead and 2)acid. Also there was a generation of cheap Chinese lead-acid E-bikes already and they did catch fire, mostly because of dodgy wiring.

prmoustache 2y ago
Looking at the video it looks like 18650 batteries in a casing that allow them to be replaced without any soldering by just putting them in slots like you do on consumer devices with AA or AAA batteries.
- martini333 2y ago
  Most consumer devices do not take 40 cells. Letting average joe play with 40+ amps of current at 48 volts is not a great idea.
  - Zak 2y ago
    The design of this pack seems to make it very easy to get right. Right means that the cells must be installed in the correct orientation, must all be the same make, model, and age, and must meet the continuous discharge rate requirement for the application. I'm sure someone will find a way to get it wrong, but people also find ways to mishandle fuel for internal combustion vehicles with predictable consequences. The accident rate doesn't need to be zero for this to be a good idea.
    - vallettea 2y ago
      in cas the user puts it in the wrong direction, there is cell level fusing: https://docs.gouach.com/eco-designed-batteries/additional-benefits-of-the-gouach-approach#1bc2d10834344a9ba428a1dd0a451637 https://docs.gouach.com/eco-designed-batteries/additional-be...
- fuzzfactor 2y ago
  Actual soldering was determined to be unsuitable way back with Ni-Cd rechargeable/disposables because solder just isn't quite a good enough conductor of electricity for the duty. Plus when current is flowing, where more resistance is encountered will be the places where more heat needs to be dissipated, and solder melts too easily. Which is why they factory-welded them at instantaneous temperatures beyond the melting point of the interconnection itself.
Zak 2y ago
The Li-ion cells can be replaced quickly using hand tools. It appears to take forty 18650 cells, which cost about $5/cell for high-capacity cells purchased from reputable dealers in small quantities. Given their suggestion of replacing cells every 3 years, I find their claimed operating cost of $16/year questionable. Using the cheapest Li-ion cells you can possibly find is a good way to test how fireproof that casing really is. I like this idea, and I'd like to see user-serviceable batteries for nearly everything that uses one, but I don't love the marketing here.
- vallettea 2y ago
  we buy cells at 1,2$
  - Zak 2y ago
    What make and model of cell, and with what minimum order quantity?
rstuart4133 2y ago
The post has the weirdest comments. We have complaints about a need an app to recharge (clearly you don't), complaints about lead acid batteries (wot? - did you look at the cells), complaints about the danger of the voltage generated by 40 cells (hint: when you take it apart they are no longer connected), complaints it's a scammy web site (really - looks like a typical brochure site to me), complaints it won't withstand a fire (they have pictures a test incinerated battery pack), and complaints from new accounts. Somebody seems to have it in for this mob. The idea seems worth trying to me. Single cells dying and taking out the entire pack is a thing. It's happened to me several times. I've pulled apart the pack to see why, and discovered all these welded batteries making DIY repair near impossible. Not to mention when they are welded together like that to create high voltages they are indeed dangerous. I wish all battery packs were made this way, but I'm guessing it's expensive. I wish them luck.
- timonoko 2y ago
  The problem with this was it reads like a scam. Now I realized it was perhaps written by French who are used to more decorative language. Anyways. The idea of replacing individual cells sucks, sucks and sucks. When one cell dies in a pack, you can be sure the rest are going bad in a month. Especially this happens with good quality cells. Samsung 3000mAh were like they had timer built-in. They just went ping-ping-ping when I tried to reuse a laptop battery cells recently.
  - oulipo 2y ago
    Yes we're French sorry! We'd love any comment on how to rephrase things haha
  - oulipo 2y ago
    The point of the design is not so much individual cell replacement, but more: - replacing electronics (hard to do safely on a traditional battery, and electronics often breaks with shocks) - replacing all cells at once when they are drained (and then they are easy to reuse in second-life storage, or to recycle, because they haven't been welded and damaged)
- 2y ago

prmoustache 2y ago

Looking at the video it looks like 18650 batteries in a casing that allow them to be replaced without any soldering by just putting them in slots like you do on consumer devices with AA or AAA batteries.

martini333 2y ago
Most consumer devices do not take 40 cells. Letting average joe play with 40+ amps of current at 48 volts is not a great idea.
- Zak 2y ago
  The design of this pack seems to make it very easy to get right. Right means that the cells must be installed in the correct orientation, must all be the same make, model, and age, and must meet the continuous discharge rate requirement for the application. I'm sure someone will find a way to get it wrong, but people also find ways to mishandle fuel for internal combustion vehicles with predictable consequences. The accident rate doesn't need to be zero for this to be a good idea.
  - vallettea 2y ago
    in cas the user puts it in the wrong direction, there is cell level fusing: https://docs.gouach.com/eco-designed-batteries/additional-benefits-of-the-gouach-approach#1bc2d10834344a9ba428a1dd0a451637 https://docs.gouach.com/eco-designed-batteries/additional-be...
fuzzfactor 2y ago
Actual soldering was determined to be unsuitable way back with Ni-Cd rechargeable/disposables because solder just isn't quite a good enough conductor of electricity for the duty. Plus when current is flowing, where more resistance is encountered will be the places where more heat needs to be dissipated, and solder melts too easily. Which is why they factory-welded them at instantaneous temperatures beyond the melting point of the interconnection itself.

Zak 2y ago

The Li-ion cells can be replaced quickly using hand tools. It appears to take forty 18650 cells, which cost about $5/cell for high-capacity cells purchased from reputable dealers in small quantities. Given their suggestion of replacing cells every 3 years, I find their claimed operating cost of $16/year questionable. Using the cheapest Li-ion cells you can possibly find is a good way to test how fireproof that casing really is. I like this idea, and I'd like to see user-serviceable batteries for nearly everything that uses one, but I don't love the marketing here.

vallettea 2y ago
we buy cells at 1,2$
- Zak 2y ago
  What make and model of cell, and with what minimum order quantity?

rstuart4133 2y ago

The post has the weirdest comments. We have complaints about a need an app to recharge (clearly you don't), complaints about lead acid batteries (wot? - did you look at the cells), complaints about the danger of the voltage generated by 40 cells (hint: when you take it apart they are no longer connected), complaints it's a scammy web site (really - looks like a typical brochure site to me), complaints it won't withstand a fire (they have pictures a test incinerated battery pack), and complaints from new accounts. Somebody seems to have it in for this mob. The idea seems worth trying to me. Single cells dying and taking out the entire pack is a thing. It's happened to me several times. I've pulled apart the pack to see why, and discovered all these welded batteries making DIY repair near impossible. Not to mention when they are welded together like that to create high voltages they are indeed dangerous. I wish all battery packs were made this way, but I'm guessing it's expensive. I wish them luck.

timonoko 2y ago
The problem with this was it reads like a scam. Now I realized it was perhaps written by French who are used to more decorative language. Anyways. The idea of replacing individual cells sucks, sucks and sucks. When one cell dies in a pack, you can be sure the rest are going bad in a month. Especially this happens with good quality cells. Samsung 3000mAh were like they had timer built-in. They just went ping-ping-ping when I tried to reuse a laptop battery cells recently.
- oulipo 2y ago
  Yes we're French sorry! We'd love any comment on how to rephrase things haha
- oulipo 2y ago
  The point of the design is not so much individual cell replacement, but more: - replacing electronics (hard to do safely on a traditional battery, and electronics often breaks with shocks) - replacing all cells at once when they are drained (and then they are easy to reuse in second-life storage, or to recycle, because they haven't been welded and damaged)
2y ago