Join Date: Feb 2017
Location: St. Louis, Missouri
The Juniors that have failed all have had one tip-off to the electronics failure: The green LED will flicker erratically. According to Deltran, there is no other cause for that other than an internal electronic failure.
With other chargers, or ones that have had too high a rating for the amp/hr capacity of the battery, I have seen batteries melt, boil over, remove paint, and etch frames. But all those cases were with lead-acid batteries, never with an AGM battery. Either I have been extremely lucky these past 20 years or AGM batteries just do not boil over, melt, catch fire, or a Battery Tender Plus malfunction doesnt happen, or a combination of the 2.
When I do take one of my bikes out, the power strip for all 3 Tenders is switched off, so periodically all of the bikes see no charging or tending action.
The Plus charging rate at full tilt is 1.25A, the Jr. is .75A. Enough to possibly, evenutally rin a battery dry, although before my bikes used AGM and I was using lead-acid batteries, I never had a battery run low. Deltran did warn about this in the manual supplied with the Tender.
The original Tender used a translucent plastic 2-wire connector, square on the bottom, roof-shaped on top. The Tender Plus that succeeded the Tender use a SAE rubberized molded connector, with an encapsulated female terminal and an exposed male terminal.
The charging rate strategy was also changed in the Plus to me more compatible with the AGM batteries that succeeded the lead-acid batteries. The Plus works well with both lead-acid and AGM, but the original Tender had problems charging the AGM.
In any event, I check my battery capacities at least once every 2 months. When I see that capacity dropping, the battery gets replaced.
My sister-in-law who lives in Florida 4 months out of the year was hesitant to use a Battery Tender in her '05 Mustang while she was gone, claiming she heard of battery maintainer-caused fires. A call to the local department told her the reasons for the fires were people using damaged extension cords between the wall outlet and the Tender. I keep mine plugged into the wall outlet, but instead of using an extension cord, I use a Battery Tender extension cable between the Tender and the battery. As I said, 20 years and not an issue whatsoever.
The recommended initial charging rate is 1/10th the amp-hr capacity of the battery X 10 hours. Beyond the initial charging procedure, the 1/10th recommendation still applies. According to Yuasa, the YTX12-BS as used in a '04-'17 DL650 Vstrom 10 has a rating of 10 amp-hours. The Tender Jr would be ideal having a maximum charging rate of .75 amps. The '02-'16 DL1000 Vstrom uses a YTX14-BS, which has a rating of 12 amp-hours, for which the Tender Plus would be a better choice as it has a charging rate of 1.25A. All 3 of my bikes have batteries of a 12 amp-our rating and are on Pluses. My son's SV650, with the YTX-12BS sits on a Battery Tender Jr.
I dont worry about any of the 4 in my garage, but I am vigilant.