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FJR Motorcycle Forums
Technical & Mechanical Problems
Using a battery tender
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<blockquote data-quote="Zorlac" data-source="post: 321720" data-attributes="member: 6478"><p>"Z, call me confused here, but didn't you just post that a 1A charge was fine, and then come out with this comment? You got some 'splaining to dooo."</p><p></p><p>Very deeply discharged batteries will initially draw a very large amount of current from the charging voltage source assuming the charger can put out that amount of current without it's voltage being pulled down by the battery's load.</p><p></p><p>Gradually, as the battery accepts a charge, the current drawn from the charger will taper off as long as the applied voltage is held constant at at say 13.8V.</p><p></p><p>If the charger is a constant current type of charger, the voltage out of the charger will increase to keep the same current flowing and eventually cook the battery if it's not disconnected. This is what I was eluding to when I wrote about forcing .6A into a 12Ah battery indefinitely.</p><p></p><p>Suffice it to say that a "battery tender" can be hooked to damn near any 12V battery for maintenance purposes, but would probably be unable to resuscitate a fully discharged battery in less than a day due to it's limited current output and may actually self destruct in the process.</p></blockquote><p></p>
[QUOTE="Zorlac, post: 321720, member: 6478"] "Z, call me confused here, but didn't you just post that a 1A charge was fine, and then come out with this comment? You got some 'splaining to dooo." Very deeply discharged batteries will initially draw a very large amount of current from the charging voltage source assuming the charger can put out that amount of current without it's voltage being pulled down by the battery's load. Gradually, as the battery accepts a charge, the current drawn from the charger will taper off as long as the applied voltage is held constant at at say 13.8V. If the charger is a constant current type of charger, the voltage out of the charger will increase to keep the same current flowing and eventually cook the battery if it's not disconnected. This is what I was eluding to when I wrote about forcing .6A into a 12Ah battery indefinitely. Suffice it to say that a "battery tender" can be hooked to damn near any 12V battery for maintenance purposes, but would probably be unable to resuscitate a fully discharged battery in less than a day due to it's limited current output and may actually self destruct in the process. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Using a battery tender
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