Battery Tender??


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  1. #1
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    Battery Tender??

    I have kept my bike on a battery tender since I installed the battery in 2011. I never had any trouble with it. A friend called me yesterday afternoon. His wife's bike which she almost never rides has been on a tender for two years. He called me to ask about the condition of the battery. Evidently it is bone dry no electrolyte at all left in it. Anybody else ever experience anything similar?

    I don't know what kind of tender it is. I did ask was he sure it was a tender and not just a trickle charger. He says it was a tender.
    I will be checking the fluid in my battery tomorrow. To be honest I haven't really done anything except make sure the terminals were tight for 5 years.
    I have a volt meter in my fairing which I do frequently check as I ride or before starting. Never had a problem.

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    IndyX is online now Fast Red Club Member
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    Sounds like they had battery with a crack somewhere or other issues. Tender not going to cause that.

  3. #3
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    2 years.. battery just dried out on its own.. it is water and acid. and a vent..

    Owner Fault.

    and may want to sent tender back to factory for inspection... as most have a long warranty. I own 3. and all are used 24/7/365. 1 standard and 2 jr's.

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    SPARKY5151 is offline Senior Member California Riders Group
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    There are several inexpensive tenders on the market that do not regulate that well, the one from Harbor Freight comes to mind first. I have several of the HF tenders and several expensive tenders, I don't use the HF tenders any more as I have had the drying out problem with them. I have found that using a timer with the tender is the ideal situation, I leave the tender plugged in all the time during the winter but I have mine set up to tend (charge) for only an hour each day and I don't use the tender at all during the summer as the bike gets used regularly. Unless the battery is a sealed cell battery it is a good idea to check the electrolyte level several times a year and top off with demineralized water as needed. Leave a small air gap below the cap to keep the water from overflowing due to expansion when charging as the water heats up.

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    Vinish is offline Super Moderator
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    I didn't know they still made any motorcycle batteries where you had to check the water level. I thought they were all the sealed type. Even when I bought one online and it came with the acid/water/electrolyte liquid that I had to add, the top sealed after the liquid was added and the liquid level could no longer be inspected or changed. I thought all these batteries were sealed. Guess I was wrong. Dang, I've only been up for 30 minutes. Usually I'm not wrong for the first time each day until I've been up for at least an hour.

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  10. #6
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    cheap batteries do.. not higher priced units. they are sealed after filling.

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  12. #7
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    I have had this happen but with a car battery. The tender was from Mill's Fleet Farm and an off brand. It was attached to my '65 Buick street rod supposedly for the winter but it had to stay on for 8 months. The battery was bone dry and dead but came back by adding fluid purchased at the store.

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  14. #8
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    Adding ACID to any battery is a BAD practice. Do be extremely careful.

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    I have had bad experience with "battery tenders" made by companies other than Deltran. I just threw out a battery tender look alike that I bought at Advanced Auto.

    I own a cruising sailboat and in the cruising community batteries are an important topic.

    I believe that the issue with the "look alike tenders" is that they provide too much current (amps) to the battery at the wrong time. Too much current will boil off the water that is in the electrolyte.

    Deltran has a LOT of good information here: http://www.batterytender.com/Battery-Basics In particular read and comprehend the area labeled Battery Charging Algorithm Fundamentals

    Most motorcycle batteries are flooded lead acid (FLA) batteries. FLA batteries can be "maintenance free," aka. Sealed Valve Regulated (SVR) or Valve Regulated Lead Acid (VRLA) batteries - which actually means maintenance proof, or in the case of a traditional FLA they will have caps. Alternatives to FLA include Absorbed Glass Mat (AGM), Gel-Cell, Lithium-Ion (and there are about five different flavors of these). Each of the different battery types will accept current at different rates.

    Each motorcycle voltage regulator is designed and built to support a specific battery type (FLA, AGM, Gel, Li-ion) and provides the correct charging voltages to the battery depending upon the battery's State of Charge (SOC). For FLA the regulator provides ~14.2 VDC when the engine is running, and when the SOC is below 100%. When the voltage regulator sees ~14.2 (or whatever the set point actually is) it simply shuts the alternator off, and the bike runs for a bit on the battery.

    You can delve deeper into the state of Battery Technology, and batteries in general here;
    http://jgdarden.com/batteryfaq/carfaq.htm

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  17. #10
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    I wish I was home.. to provide more information..
    years ago (many) a main processor was developed and was offered to venders to develop uses for the battery monitors systems...

    I have in the basement the development system on a breadboard with processor that later went into the Delton system.

    so a 10 dollar smart charger is Not possible...
    if I remember correctly.. the breadboard with processor was $150.00,

    company I worked for did not use it in the development of a 16 channel analog to digital converter.
    I also have a working prototype of the 16 channel A/D with programmable digital output for relays and controllers... I used it for a time to monitor (5) 12 volt batteries. and to turn on and off chargers to the batteries. Using IEEE488 commutations to a computer. over the winters. I am talking around 1990- 96.

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