Fun fact: Some (not all) defective SLA batteries will make a rattling sound when shaken. I believe this is caused by lead sulphate that has fallen off the internal plates. In my experience, all batteries that rattle when shaken are bad. But not all bad batteries rattle. it would be interesting to know if your bad batteries make noise when shaken. The noise sounds as if there were loose screws rolling around inside the battery case. I fabricated a dummy test load using a wooden board, AC power cord and 3 ea. 120 volt lamp,sockets. I can easily create a 180 watt test load using 3 standard 60 watt incandescent lamps. Higher (or lower) custom loads can be setup by changing light bulbs. This setup comes in handy when performing run-time calibrations on larger APC rack systems.
Interesting information. These types of batteries are AGM with fiberglass mats inside and should be wet but not sloshing around. The rattling sound might mean they are dry on the inside along with something loose inside. I wonder if new Li-Fe-Po batteries are worth changing them out with, but I worry about lithium as they have their own potential catastrophic dangers. Heh, for load testing, I use a 3 speed fan.
Great vid! I would love to see more OR stuff, anesthesia machines, video systems or whatever!
Fun fact: Some (not all) defective SLA batteries will make a rattling sound when shaken. I believe this is caused by lead sulphate that has fallen off the internal plates. In my experience, all batteries that rattle when shaken are bad. But not all bad batteries rattle. it would be interesting to know if your bad batteries make noise when shaken. The noise sounds as if there were loose screws rolling around inside the battery case. I fabricated a dummy test load using a wooden board, AC power cord and 3 ea. 120 volt lamp,sockets. I can easily create a 180 watt test load using 3 standard 60 watt incandescent lamps. Higher (or lower) custom loads can be setup by changing light bulbs. This setup comes in handy when performing run-time calibrations on larger APC rack systems.
Interesting information. These types of batteries are AGM with fiberglass mats inside and should be wet but not sloshing around. The rattling sound might mean they are dry on the inside along with something loose inside. I wonder if new Li-Fe-Po batteries are worth changing them out with, but I worry about lithium as they have their own potential catastrophic dangers.
Heh, for load testing, I use a 3 speed fan.
USB connector appeared to be connected, it popped off when you separated the front panel.