The following described method is for those of us with more time than money. But this may be an increasingly valuable skill in a prolonged austere environment. Note that this pertains only to 12 VDC flooded lead acid batteries, including semi-sealed or “maintenance-free” batteries. This will be a succinct tutorial.
This is an old-school method, a technique of a bygone era. It is nothing new, but old school and time-tested. I have more than 40 years of experience in the automotive world. I’ve known about this since the early 1980s. My success rate is now at 70 percent, yet how I define what is a success is highly imprecise, or generous. Given the high cost of a typical automotive battery is now between $150 to $175, and given that in an austere environment any battery that contains a useful amount of electrical power, that battery has more value than what is considered serviceable today. If it can hold enough power to run a single transceiver for several weeks, then it is useful in my book.
To restore a battery to near new or to a level that it will reliably start a vehicle in cold weather, then my success rate is about 50 percent. I have also restored 10-year-old deep cycle flooded lead acid batteries used for a PV System from completely “dead” to a good condition where the resting voltage is 12.6VDC and its capacity is about 90 percent of what factory fresh batteries provide. Large deep-cycle batteries are now quite expensive. In the last month, I’ve recently restored 20 batteries back to serviceable levels. This means that I have saved a significant amount of money and I now have a stockpile of batteries for the coming collapse of society. Many of the batteries were purchased at an automotive parts store for just the price of a “core” charge — which is based on the scrap value of lead.Continue reading“Extending The Life of Flooded Lead Acid Batteries, by Tunnel Rabbit”