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Post by magoconnor on Nov 27, 2018 14:30:14 GMT -5
Hello.
Im working on my new scooter projekt, which includes alot of choping and cutting,
And it seems I have run out of space for the battery... (at least the stock size battery).
I have been reading up on these "new" lithium ion batteries, and it seems like they might fit the bill:
Light weight - Small - And can be mounted anywhere pointing up or down.
The only thing is they are quite delicate, and one should take care not to overcharge them or drain em.
My plan is to run it in a "safe" circut with a fuse between the battery and the rectifier to prevent it from overcharging and going up in flames.
Also Im gonna install a volt gauge just in case.
Is this a good plan? And are there anything els I should add as a safety precaution?
It will be installed on a 90cc 139qmb, how many ah should I go for?
Cheers Mag.
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Post by gsx600racer on Nov 27, 2018 16:48:45 GMT -5
Id stick with lead acid. The charging system on scooters are not friendly to lithium chemistry batteries.  |
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Post by dexameth on Nov 27, 2018 17:14:45 GMT -5
I like the idea of the Shorai batteries. They are designed for scooters and powersports, and then they have their own standalone charger that actually repairs the lithium cells. So, install, ride and maybe once a month use the special charger to "maintain" it and you'll be fine. BatteryChargerOn my little Scootie I wanted the smallest battery I could find in AGM, so I went with this battery. |
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Post by FrankenMech on Nov 27, 2018 18:22:54 GMT -5
A regular 7 or 8Ah sealed lead acid (SLA) battery like the ones used in UPS power supplies would work. They can be mounted in any position and would not require special chargers. They are also cheaper than the wet-cell lead acid batteries used in many scoots.
I think the scoot manufacturers use the wet-cell batteries because they can survive long periods of storage before activation with electrolyte.
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Post by lilpinny on Nov 27, 2018 21:19:33 GMT -5
When I switched to Lith-Ion I ended up getting a new harness that was better built. I also swapped out my cheapo chinese rectifier for a US built rectifier that was designed for Lith-Ion and has a lower set point. A standard rectifier will work, it's set point is ~1 volt too high which isn't enough to over charge it to where it'll meltdown, but it will lower the life expectancy of it.
Just be careful that you get a quality battery and don't go cheap on them. When you hear about Lith-Ion batteries catching on fire randomly it's because they are cheap.
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Post by SMALL CC TEK on Nov 27, 2018 21:54:43 GMT -5
I have used them all and i am still a lead acid battery guy . I like the ion for special application like tight spot mounting in the front of the scooter up high . And on a chinese scooters with a marginal charging system i could never get the ion fully charged . The lead acid will stay up even if your scooter is only charging at 11.7 and you ride it for 30 min or so in decent weather , if it's cold your done yeah it shortens the battery life but you can make it work. I used a imax charger and that works sweet for charging a ion or any battery for that matter .
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Post by lilpinny on Nov 27, 2018 22:29:22 GMT -5
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Post by fugaziiv on Nov 28, 2018 11:17:16 GMT -5
There's a major common misconception when it comes to lithium powersports batteries. Lithium Ion Polymer (LiPo) batteries overcharge and explode. These are in your phones, computers, RC cars and planes, Teslas, stuff like that. Powersports batteries, such as Shorai are actually Lithium Ion Iron (LiFe). These are MUCH more resistant to abuse, and are VERY difficult to (but not impossible) overcharge to the point of fire. Your scooter charging system would have to be putting out some crazy juice to explode one, plenty enough that things wouldn't be running right anyway and you'd be frying regulators instantly. It is usually however beneficial to choose a LiFE battery system and stick with it. The dedicated chargers aren't cheap, but they are worthwhile to greatly extend the life of the battery. The better Lithium battery brands will have dedicated chargers for their batteries, and these are the brands that you'll want to stick to. For example, as dexameth mentioned, Shorai batteries have a dedicated port for their own charger, and that charger independently tests and levels each of the battery's cells whereas a standard charger won't do this. It makes a big difference, and when you're spending this much on a battery it's absolutely worth considering. Matt |
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Post by lilpinny on Nov 28, 2018 11:28:55 GMT -5
My Ballistic LiFePO4 after a surge that blew the rectifier. All that unregulated voltage going back to the battery.  I've overcharged them slightly many times before, and that voltage dissipates pretty quickly. I had something bad in the harness and I knew I blew the rectifier when I was riding (the headlights popped)... I thought I could make the three miles home doing 55mph. Nope. |
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Post by fugaziiv on Nov 28, 2018 11:48:38 GMT -5
My Ballistic LiFePO4 after a surge that blew the rectifier. All that unregulated voltage going back to the battery. I've overcharged them slightly many times before, and that voltage dissipates pretty quickly. I had something bad in the harness and I knew I blew the rectifier when I was riding (the headlights popped)... I thought I could make the three miles home doing 55mph. Nope. Once the rectifier goes, all bets are off. If your headlights popped, you're definitely in the danger zone for even LiFe. Matt |
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Post by lilpinny on Nov 28, 2018 13:24:15 GMT -5
Yeah. Totally extreme case.
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Post by magoconnor on Nov 29, 2018 12:58:18 GMT -5
Damn man.. what about the rest of bike? Im using a kymco/sym harness and rectifier, made in taiwan. I think its okay, it charges the battery well. Okay, so what you are saying, dont go cheap on the battery and get a good charger. I think it should work, at least it does on motorcycles. What do you guys think about this battery: www.boschautoparts.com/en/powersport/batteries/lihium-ion-batteries |
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Post by lilpinny on Nov 29, 2018 14:02:41 GMT -5
I'm not sure about that particular brand. There wasn't any technical specs on that site. I always used/use the Ballistic batteries. They also sell a tender that's built specifically for their batteries. The EVO2's are the performance batteries that are sometimes smaller than your stock battery. The EVO3's are the same battery, just in a form factor that is exactly the same as their Lead/Acid equivalents. The rest of the bike: (which is all fixed now and running like a champ)  |
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Post by FrankenMech on Nov 29, 2018 16:05:19 GMT -5
Dry chemical fire extinguishers make a horrible corrosive mess  |
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Post by lilpinny on Nov 29, 2018 17:13:50 GMT -5
Dry chemical fire extinguishers make a horrible corrosive mess  hell ya. if it ever caught fire again I'd let it burn. The extinguisher did nothing for the fire and did more damage to the bike than the fire ever would have done. I got a Halon one after that.. but I wouldn't have been carrying that anyway. |
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