Hi philh,
Batteries don't "boil" unless the temperature inside them is 337 C (~638 f). They do gas.
The device you suggest may cause both positive and negative plate shedding. Basically it "knocks" the hard sulfate off the plates. That buys some time--but the total capacity (amp hours) drops and once the space beneath the plates fills up the battery has had the biscuit.
Here is an example of one such device. I really DO NOT recommend it.
https://www.instructables.com/id/Simplest-Chargerdesulfator-Ever/philh wrote:
M. Wanderer
I built a device using a cap and a bridge. Plans came with strong warning that the product would kill you.
I've taken "weak" or even dead batteries, hooked up to this thing and once the liquid begins a slow boil, disconnected it. Batteries will typically test using a load meter nearly full strength.
Are you suggesting this doesn't actually work and I'm fooling myself?
