3 ms·

I don't bust out the drill or try to apply putty for a temporary tooth. That is to say, yes, I can confidently exchange batteries (clean my teeth). I'm not co

I don't bust out the drill or try to apply putty for a temporary tooth. That is to say, yes, I can confidently exchange batteries (clean my teeth). I'm not confident in modifying those batteries with a welder/soldering iron. If I clean my teeth and they still hurt you bet I'm going to the dentist.

immibis 3y ago
For people who do this, it's more like changing batteries, than modifying them. You only put the batteries into the slots and attach metal wires to the ends - isn't that a lot like changing batteries already? The device which attaches the wires is simple to use: you press it against the connection, press the foot switch and it makes a little spark and now the wire is attached. If you know what you are doing, building a battery pack out of pre-fabricated cells is not scary.
- wolverine876 3y ago
  Then what are they welding in the OP?
  - immibis 3y ago
    I don't see any pictures of welding happening in the OP. I do see a battery pack constructed with the usual spot-welded metal strips. The spot welder is the machine that you press against the connection, press the switch and it goes zap and you have a connection. It isn't especially dangerous, as far as I know. It uses a low-voltage high-current pulse to melt and fuse the metal only at the contact points.
    - jononor 3y ago
      Errors that may lead to a thermal runaway: Accidentally shorting a cell. Putting the cell in backwards. Putting a highly charged cell with discarded cells (or vica versa). Using a damaged cell. Any of these can happen rather easily, with potentially disastrous consequences to life and property.
      - immibis 3y ago
        Many things are dangerous. Use caution and have a backup plan (keep the area non-flammable and keep a bucket of sand nearby) and you'll be fine.
        wolverine876 3y ago
        > Many things are dangerous. That's not a rational response. Everything is dangerous. The issue is how dangerous they are.

immibis 3y ago

For people who do this, it's more like changing batteries, than modifying them. You only put the batteries into the slots and attach metal wires to the ends - isn't that a lot like changing batteries already? The device which attaches the wires is simple to use: you press it against the connection, press the foot switch and it makes a little spark and now the wire is attached. If you know what you are doing, building a battery pack out of pre-fabricated cells is not scary.

wolverine876 3y ago
Then what are they welding in the OP?
- immibis 3y ago
  I don't see any pictures of welding happening in the OP. I do see a battery pack constructed with the usual spot-welded metal strips. The spot welder is the machine that you press against the connection, press the switch and it goes zap and you have a connection. It isn't especially dangerous, as far as I know. It uses a low-voltage high-current pulse to melt and fuse the metal only at the contact points.
  - jononor 3y ago
    Errors that may lead to a thermal runaway: Accidentally shorting a cell. Putting the cell in backwards. Putting a highly charged cell with discarded cells (or vica versa). Using a damaged cell. Any of these can happen rather easily, with potentially disastrous consequences to life and property.
    - immibis 3y ago
      Many things are dangerous. Use caution and have a backup plan (keep the area non-flammable and keep a bucket of sand nearby) and you'll be fine.
      - wolverine876 3y ago
        > Many things are dangerous. That's not a rational response. Everything is dangerous. The issue is how dangerous they are.