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Many “electronic” battery chargers won’t work if the battery is dead, just hook up an antique charger that never shuts off and let it charge 24 hours
If you have a desulphator charger you likely will still need an antique one to keep it running, thats what I do on my fathers 3 year old motorcycle battery, I hook both the 40 amp desulphator and the old 6 amp unit
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