I left my lead acid battery in my scooter and have not touched it for last 3 months. Now the open circuit voltage is only 6V. Is my battery permanently dead, or is there a way to repair it?

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    \$\begingroup\$ What terrible conditions was it in that three cells died? \$\endgroup\$ – Ignacio Vazquez-Abrams Sep 17 '17 at 19:49
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    \$\begingroup\$ it's probably dead, but it's cheap to try recharging it... \$\endgroup\$ – dandavis Sep 17 '17 at 19:52
  • \$\begingroup\$ Refill with destilled water to max level, apply current limited 16V until current has dropped a lot and let it bubble slowly for an hour more. If it doesn't revive it, nothing short of a polarity reversal in a water bath is going to. \$\endgroup\$ – winny Sep 17 '17 at 19:58
  • \$\begingroup\$ My scooter has an alarm system, I think it has been overdraining current out of it. I've tried a lead-acid battery charger, it's stuck on testing and trying to save the battery Anway, it says it's a sealed type battery and also says never to add water. Should I open it anyway? \$\endgroup\$ – user1712263 Sep 17 '17 at 20:22
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    \$\begingroup\$ If it's sealed there's no use opening it as it will very likely be gell based instead of having a fluid inside. You could try reviving it if you have a lab supply or another device which can slowly charge it. In general though, deep discharging (and that's what has happened here) is the end of story for a lead-acid based battery. When you get a new battery, also get a trickle-charger or some device that keeps the battery topped-up and use that next time you don't use your scooter for a long time. \$\endgroup\$ – Bimpelrekkie Sep 17 '17 at 20:35

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