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Low cost way to monitor your 12V Battery

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Drat. I was slowly coming to this conclusion.

Would putting a batteryminder 1510 with desulfanator on the 12v occasional help preserve the battery better than simply keeping the car plugged in?

https://smile.amazon.com/BatteryMIN...327324990001&ref_=sbx_be_s_sparkle_mcd_asin_1

I have a battery reconditioner from black and decker that I use. It really works. We have a Corolla with a 9 year old battery that works like new now but 4 years ago I was jumping it every two days.

I disconnect the Tesla 12v once a year and run the condition mode. Not sure if it's going to help but I am on year three right now so it hasn't hurt I suppose.

BLACK+DECKER BC15BD Fully Automatic 15 Amp 12V Bench Battery Charger/Maintainer with 40A Engine Start, Alternator Check, Cable Clamps https://www.amazon.com/dp/B00KNMKRU8/ref=cm_sw_r_apan_i_34CX358BWK3391TF9Y2G
 
Anyone know what the lithium 12v from the new 3s and Ys cost?.. I'm not going to buy one I was just thinking if they fail and people have to replace them we with the $80 lead batteries could end up in a better situation.