DavidAnthony Posted December 16, 2005 Share Posted December 16, 2005 Purchased a Battery Tender Junior and installed the cables on the battery, and plugged it in and the LED lit for a second and then went out. Checked the voltage and the unit was dead. Ordered another unit and the identical thing happened. Checked the cables on the battery and red on red. Any ideas? Link to comment
KMG_365 Posted December 17, 2005 Share Posted December 17, 2005 Battery tenders will not charge a completely dead battery, nor will they read any voltage when not connected to the battery. The circuitry has to sense a certain amount of residual charge coming from the battery to switch on the charging circuit. That's why you can't shock yourself by touching the plug end when the tender is plugged it--it's not hot until it feels that it needs to turn on. I don't know why the light would go out, but I'm not that familiar with the "Jr." model. My regular model just sits there flashing a red light if the battery is completely dead as it thinks it's not yet plugged in. Link to comment
Stan Walker Posted December 17, 2005 Share Posted December 17, 2005 I've heard you can fool the battery tender into charging a dead battery by hooking it first to a good battery, then when it starts charging the good battery, move it to the dead unit. Stan Link to comment
KMG_365 Posted December 17, 2005 Share Posted December 17, 2005 Hmmmmm, never tried that one. I just "jumped" mine with another battery for a bit and then it charged up normally. Link to comment
Al Navecky Jr Posted December 17, 2005 Share Posted December 17, 2005 Charge the dead battery with a standard charger for about an hour. the use the Tender Link to comment
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