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balga

Battery upgrade

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Hi there, 

looking to upgrade the batteries of my son 36v 16" oset, with Kelly controller.

My main goal is range, so something to last a bit longer, rather than high discharge stuff at all costs.

Was thinking about four of these https://hobbyking.com/en_us/turnigy-battery-5000mah-5s-20c-lipo-pack-xt-90.html?wrh_pdp=3  , two in series and two in parallel, to both reach 36v and get more amperage, but not sure if anything will blow up. And not sure if they can all be wired to charge together, and if total discharge is too high for the system.

If that's the case I could consider just two 24v batteries connected in parallel, as my primary goal is increase range.

But can these kind of batteries be wired to get charged together? I know there's a ton of topics on this matter but it's not the easiest thing to read through hundreds of posts.

Any ideas/suggestion?

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I use the Turnigy 3s -2200 mah batteries in my RC Helicopters.

They are very good batteries...but for charging you need a proper lipo charger with built in balancer or you can use an external "blinky" (balancer).

Either way you can only charge 1 pack at a time, per charger.

While you could try and trick it into charging the combined packs together, over time you would see a serious degradation as the cells would become too far out of balance in each pack.

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Now if you were to use a few of these batteries in parallel

https://hobbyking.com/en_us/zippy-compact-4000mah-10s-25c-lipo-pack-xt90.html

Specs:
Capacity: 4000mAh
Voltage: 10S1P / 10 Cell / 37v
Discharge: 25C Constant / 50C Burst

 

This would give  your 36 ish volts, at whatever ampacity(wattage) you need.

You would still need an appropriate balancing charger.

 

 

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thanks for the help mate, unfortunately those batteries are not available in australia, not sure if they can be shipped.

I have realised that I gotta take apart the system when charging, but on youtube :unsure: there's plenty of people using balancing boards to parallel charge them together, I guess it's better than nothing, is this the thing you're referring to when talking about out of balance? How long do you think it would take before that to happen? We use and charge the bikes twice a week every week.

did some research overnight, hope to have understood the fundamentals right and wrote down many options and my reasoning is:

the kelly controller I put in is rated to work within 24-36V and 60A with 100A peak. 

The battery I have now are three Drypower lead acid, whose characteristics of discharge can only be inferred by the model name 12SB10C, and it's a 10Ah, SO I can suppose that if this battery discharges at 10C, feeds well the controller, hence my actual wattage is ranging between 36Vx60A = 2160W and 3600W peak - it is actually less than that as I programmed the controller  to the tamest setting to reduce wheelspin.

Now I would say that the overall system ought to be over 10Ah, to have same range as original and above 24v to avoid cutoff - even if I tested the controller working fine up to 18v.

If I put two of  https://hobbyking.com/en_us/multistar-high-capacity-16000mah-4s-12c-multi-rotor-lipo-pack-w-xt90.html in series

Minimum Capacity: 16000mAh
Configuration: 4S2P / 14.8V / 4Cell
Constant Discharge: 12C
Peak Discharge (10sec): 24C
Pack Weight: 1366g

I would have 6Ah additional range, 29.6V which equate to 1776W and 2960W peak at $270 plus shipping and related expenses (charger and so on). The battery pack would also stay relatively cool, as the amperage entering the controller is less than half the constant discharge of the battery, (60A vs 196A and 100A vs 384A).

To counter the power loss, should that be an issue I could re-set the kelly controller to a wilder setting. Plus the original batteries weight 9.9 kg in total, against 2.8 kg for this system, so the weight factor alone should counter the power loss reasonably.

The other only alternative is to get one at 14.8v and another at 22.2V, and put it series, this would bring me to 37V with the same stamina, but I'm somewhat reticent in getting different voltages as they cannot be parallel charged. But I guess that I could get two cheap chargers and be done with it.

What do you think? 

Edited by balga

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I have 6 of the batteries you put in your first post on my sons 2015 36v oset, they last ages, 4 is easily enough to do a trial on 6 is good if we go trail riding. The original batteries used to last about 4 miles the furthest we have ridden with these is 15 miles and they were still not flat.

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Alright, here’s an update in case anyone is interested in an uncommon upgrade.

The whole cost and charging process of the lipos didn’t really convince me.

So I bought two 3D printed makita diy power adapters, and 4 Chinese makita compatible 6.0ah batteries with charger indicator. 

10 minutes after I got the package the bike was up and running. Two batteries stay in the bike while the other two charge, even though a set of two almost gets him through an Oset Day here in Western Australia.

I love this setup, it’s convenient, light, powerful and somewhat cost effective.

if anything it’s even too powerful, too much discharge for the kelly controller to handle, I had to tone it down to the minimum, too much wheelspin.

87CDBC61-C432-4C3E-BBFF-90E787F03520.jpeg

3651570D-CAAF-4712-835B-ACE0B2B502D2.jpeg

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Balga: we bought a Oset 20R for our boy,  Oset Australia dealer Pete had recommended a  Boost-bikes lithium batteries as a backup at that time ,comparing standard SLA battery, this one lasts almost a whole afternoon and still extra miles left,  now almost 20months old still same good power delivery, my boy just loves it than anything. Maybe you can check with local dealer in Australia also.

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On 5/29/2019 at 1:24 PM, Mysky said:

Balga: we bought a Oset 20R for our boy,  Oset Australia dealer Pete had recommended a  Boost-bikes lithium batteries as a backup at that time ,comparing standard SLA battery, this one lasts almost a whole afternoon and still extra miles left,  now almost 20months old still same good power delivery, my boy just loves it than anything. Maybe you can check with local dealer in Australia also.


Did the Boost-Bikes 15amp battery upgrade on my sons Kuberg Trial Hero.
It was worth every penny spend, and the effect it has on the bike is tremendous. It handles better, is lighter and performs super.

I have our website with the total information on the upgrade, and if interested you can read more in detail on https://www.juniormoto.com/2019/01/23/switch-to-lithium-battery/?lang=en

Enjoy…  :)

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I ended up getting two 14.8v 20Ah LIPO turnigy batteries from hobbyking, connected in series.

They also have a charger that can charge both at the same time in parallel.

RANGE TEST: Went out last weekend, got there on saturday arvo with a full battery, afternoon ride around the camp, sunday ride all day around the property plus two of my kids doing 4 laps of 6 sections each (they ride intro) as they were sharing the bike, got home and plugged to the charger only to discover that they still had 63% charge in them.

This is the true only alternative to petrol, everything else is just rubbish, IMHO.

Not sure about longevity, if vibrations are going to stuff them up, or dust getting into balancing ports, but so far they have been great, can probably do a 3 day camping trip in the hills without need to recharge, which is huge.

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