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May 9th, 2016, 05:40 AM   #1
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lithium battery trickle charge?

Just noticed my trickle charge battery tender I have been using has written on it ....For lead acid batteries only. Oops, but seems to work okay and what about the bike's charging system that was made for non lithium batteries?

The tender has worked okay for some time. What do others use to trickle charge when changing to light weight lithium batteries?
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May 9th, 2016, 08:44 AM   #2
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I'd avoid using it!! Trickle charging is a bit different as far - as I know - than the charging that happens in-bike. It's the "intelligence" for lead-acid in the charger that messes things up. If it were a stupid charger it'd be better, if that makes sense? (Not 110% on this, maybe it's OK.)

But: I don't trickle charge my LiFePO4 - I have it on an Andersson connector and just pull it from the bike when it's parked for a while. LiFePO4's don't self-discharge anyway so there isn't really a need for trickle charging. Two things discharge a lead-acid battery on a parked bike: The leakage current from the electric system because it isn't COMPLETELY off or disconnected, and then the self-discharge. LiFePO4's don't really self-discharge, so if you pull the battery you don't need to trickle charge
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May 9th, 2016, 09:54 AM   #3
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Battery Tender, and other manufacturers, make specific chargers for lithium batteries. I have a couple of them, and I have not had any problems leaving them plugged in, just as I do with my lead-acid batteries. The lithium charger seems to work fine on a lead acid battery. There are some lithium batteries that do not require a special charger. A friend has one in his 570, and he is using a regular Battery Tender with no problems after one year. I don't remember the brand of the battery.
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May 9th, 2016, 10:59 AM   #4
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Gain is minimal to risks, yuasa is the most stable led battery imo.
Led on all my bikes! Race bikes aswell.

Last edited by TomTom; May 9th, 2016 at 11:08 AM.
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May 9th, 2016, 12:49 PM   #5
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Originally Posted by TomTom View Post
Gain is minimal to risks, yuasa is the most stable led battery imo.
Led on all my bikes! Race bikes aswell.
FWIW I don't really see any risk - and the weight difference is noticeable for sure!
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May 9th, 2016, 05:51 PM   #6
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hmmmm I never charge my Li-on batteries! But maybe that's because I ride em a lot

It's my KTM 1190 ADV that I always have to plug in, guess I have my priorities straight.
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May 10th, 2016, 03:19 PM   #7
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As noted above, the Lithiums don't have much of a discharge rate while not in use, so maintenance charging isn't needed.

If it is, dumb chargers are fine, like bike charging systems, smart ones are only smart for lead based batteries and can stuff up Lithiums.

After a I fitted a Earth X to my FE650, I stopped using a CTek charger. The Lithium lost charge over time. I decided that I have some parasitic loss for reasons not yet clear, so fitted an ingition switch and all good now.
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