Lightweight battery - KTM Duke 390 Forum
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post #1 of 19 Old 04-12-2019, 05:32 AM Thread Starter
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I want to fit a lightweight lithium battery to my Duke 390.
There’s a 3kg weight saving right where you’d most want it on the bike.
Can someone tell me what battery is fitted to the Duke 390, to save me having to disconnect and remove it twice?
Thanks
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post #2 of 19 Old 04-12-2019, 11:10 AM
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I want to fit a lightweight lithium battery to my Duke 390.
There’s a 3kg weight saving right where you’d most want it on the bike.
Can someone tell me what battery is fitted to the Duke 390, to save me having to disconnect and remove it twice?
Thanks
There you go 10ah on the right suggest you don't go any lower I tried a 7ah and she struggled to fire up. Massive weight saving. Lightweight battery-img_20190310_145416.jpg
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post #3 of 19 Old 04-12-2019, 11:12 AM
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Originally Posted by lightning View Post
I want to fit a lightweight lithium battery to my Duke 390.
There’s a 3kg weight saving right where you’d most want it on the bike.
Can someone tell me what battery is fitted to the Duke 390, to save me having to disconnect and remove it twice?
Thanks
Oh and you will need a charger for lithium batteries.
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post #4 of 19 Old 04-12-2019, 12:03 PM
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Owners manual says ETZ-9-BS .
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post #5 of 19 Old 04-12-2019, 12:07 PM
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One thing does puzzle me , why do you need a special battery charger if the bikes own charging system is ok ?
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post #6 of 19 Old 04-12-2019, 12:13 PM
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In my Duke 390 lives, a W-standard 12Amp/h as this one is the same size as the recommended 9Amp/h.
For many, the most weight gain in an even more important place is to lose weight as a rider.
I do agree though, to change to a Li-Ion batt is by far the easiest way
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post #7 of 19 Old 04-12-2019, 02:37 PM Thread Starter
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One thing does puzzle me , why do you need a special battery charger if the bikes own charging system is ok ?
I guess it’s for when the bike is not in use for a time and you want to maintain the battery with a smart charger.
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post #8 of 19 Old 04-12-2019, 02:44 PM
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Yes I know but I believe they have to be lithium battery specific not something like an Optimate or other smart charger !
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post #9 of 19 Old 04-13-2019, 05:23 AM Thread Starter
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Well l have ordered the Exide one, weight 0.7kg!
Probably won’t need a maintenance charger, lithium batteries don’t lose their charge over time like lead acid ones.
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post #10 of 19 Old 04-13-2019, 07:43 AM
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Well l have ordered the Exide one, weight 0.7kg!
Probably won’t need a maintenance charger, lithium batteries don’t lose their charge over time like lead acid ones.
Lithiums do lose charge over time, just the same as lead acid ones. So you will need a charger if leaving the bike for long periods.

I have a shorai in mine and it's great. So much lighter.

You will also have to think about how to mount it, as they are usually much smaller than the stock one. I went with a custom 3d printed setup for mine, but you can bodge it more easily with zip ties.




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