Not all sealed batteries are AGM, but most are SLA or VRLA right? Shake shake them can hear water sound one.

System Error Message
I have different understanding from what you're saying about AGM:
- if sealed vs non-sealed price is close, the sealed is not AGM, as there would be the useless battery health indicator on top like this.

- AGM are very expensive, and cannot use the health indicator
- backup battery for alarm, those black colored ones, are mostly AGM this I believe is true

Thanks for sharing your battery invention. Hope it works.

This post has been edited by alexei: Mar 25 2022, 01:19 PM