PINNED - Lithium battery conversion/info

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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 14 Nov 2017, 12:53

89km is 52 miles. And you used just over half the battery.

And these are real world measured figures. (not ISO test dreamland ones).

Thats good!
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 14 Nov 2017, 16:29

well you beat my record - that must take at least 6 hours nonstop -

what time did you start and what time was it when you got back home -
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Re: PINNED - Lithium battery conversion/info

Postby Gnomatic » 14 Nov 2017, 16:40

That is fantastic snaker! :thumbup:
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 14 Nov 2017, 21:14

6h 20m download/file.php?id=7309&mode=view
And 32 mins not moving.

The average speed is always accurate. Even over say 30 yards. As long as its got a few sats locked. But short term short distances can read high or low. Thats why you see silly max speeds.
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Re: PINNED - Lithium battery conversion/info

Postby snaker » 15 Nov 2017, 02:07

expresso wrote:well you beat my record - that must take at least 6 hours nonstop -

what time did you start and what time was it when you got back home -

Yes, it was 6 running hours. I started at 7:30 and got home at about 14:00.

Time in VN is different from in EU/US. We usually wake up at 5AM, working time starts at 7-7:30. Some farmers even have to start working at 4AM to bring their products to local markets. At 7AM, streets are already crowed. In bigger cities, working time starts later, about 8AM. In opposite, 10PM means very late here. If a young girl gets home later than 10PM, she would be accused as a 'bad girl' :lol:
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 15 Nov 2017, 02:24

5am !!! - sometimes i am not sleeping till 3AM - forget waking up early
Quickie P222se - 60Ah ADD ON
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Quickie P220 - Indoor Chair
Bounder Plus - 180Ah LifePo4
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 15 Nov 2017, 03:13

I'm interested in your chair rather . It seems ultra efficient and fast . You said it is a CHINESE brand .

Would you let us share your super good pick ? Post photos of it here .

:dirtbike :bounce :biker
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 15 Nov 2017, 03:17

Main reason, hes under 50kg. And no fancy heavy seating...

Remember it takes double the energy to push twice the mass the same distance.

His chair is now lighter. Has no weight doubling seating. And he is under 50kg. :cussing
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 15 Nov 2017, 03:27

snaker wrote:My maddest range: 83km/89.5 returned Ah. :clap



I think you've created a GUINNESS WORLD RECORD already .

Truely , 83km in less than 6 hours for a wheelchair is hard to break . hanged
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 15 Nov 2017, 03:32

Hes only just warming up! :clap :fencing butred
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 15 Nov 2017, 04:04

Definitely , he still has half empty tank .
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Re: PINNED - Lithium battery conversion/info

Postby snaker » 15 Nov 2017, 04:21

shirley_hkg wrote: I think you've created a GUINNESS WORLD RECORD already .

Truely , 83km in less than 6 hours for a wheelchair is hard to break . hanged


I bought this chair here, my model is EPW68. Now they released faster models EPW65/EPW65S. Their specs state 13kph just to meet EU/US 'definition' for powerchairs. Its real speed is 14.5kph. And by increasing motor voltage to max 25V, it could reach 18kph => a decent speed. One day if I save enough money, I will pick EPW65. Its price is reasonable, as I remember it is only $1.500. Its downside is 2-pole motors and as other Chinese products it needs some customizing/modifying to drive ... safely.

http://enjoycare.com/En/ProductList.asp?SortID=1

I know myself 'mad' in driving. Soon or late I will drain this 150Ah pack. I am dreaming to your 200Ah pack. Did you ever think to drain it for a single trip? If so, I wonder how do you look after the trip :mrgreen:

About the questions how does heavier weight impact on range/speed? I see it does not much impact to my chair. This 150Ah pack is 20kg heavier than my old pack, the energy consuming and speed are still the same. But tire/caster tread style and pressure do impact clearly.
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 15 Nov 2017, 04:23

Easy. Double the weight = double the Ah consumed per mile overall. Almost exactly.
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 15 Nov 2017, 04:52

snaker wrote: Soon or late I will drain this 150Ah pack. I am dreaming to your 200Ah pack. Did you ever think to drain it for a single trip? If so, I wonder how do you look after the trip :mrgreen:



The 55km long HongKong-Zhuhai-Macau Bridge is going to open early next year . Longest bridge in the world .

According to tradition , a WalkForMillions charity fund raising ceremony will be held to signify the completion of large project .

I'm looking forward to this life time opportunity . A round trip of 110km that might require my 2 add-on , making up 314Ah ready for that trip, because I need to carry my wife with me .

Sadly , I think I could hardly hit an average speed @13kph .
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 15 Nov 2017, 10:50

Adding your wife will reduce range proportionally too.

But remember that a car, or taxi, idling, will allow you to put back some power fairly rapidly. But you really want a 24V vehicle, like RV, bus, truck, or something to charge at full power.
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Re: PINNED - Lithium battery conversion/info

Postby tutatu » 15 Nov 2017, 20:26

This is enormous thread, my brain is burnt and I didn't read third of thread. czy

I'm thinking about convert to lithium on my F55. I don't know battery tray dimensions of F55. How many cells will fit in and how much power will have?


What is 18650 cell? Can I use these cells?
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 15 Nov 2017, 20:38

Where to start. Your chair can take 2x grp24 batteries.

There are many ways to fit lithium calls...

http://www.batteryspace.com/A123-System ... 00mAh.aspx
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 16 Nov 2017, 12:30

Dogsbody wrote:Hi again,

Just wondering what the current situation is for shipping lithium cells from Hong Kong to the rest of the world if anyone knows?

Hoping to get some from taobao..

Cheers,

Dog


Today I went to SHENZHEN across the border to find courier .

UPS air freight to UK :

21 --- 44 kg @ £5.8/kg , plus £55 additional charge for hazardous goods .
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Re: PINNED - Lithium battery conversion/info

Postby Gnomatic » 19 Nov 2017, 17:35

Burgerman wrote:
Buy a tin of switch cleaner, do chair end, cable both ends, charger.
If it still miss behaves check all bolts tight.


I'm now a big fan of DeOxit. After treating both the chair end and charger end Dsubs, my charge graphs went from looking like this .....

Image

..... to looking like this.

Image

Thanks for the tip.
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 19 Nov 2017, 18:46

thats great - big difference - - how did you do it - just spray over the pin and leave it alone ? both ends - let it dry and thats it ? i will get a can to have on hand - i could use that for other things also

do you cover your Dsub with those rubber covers you got ? dosnt hurt to spray every 6 months or say even if not having issues ?
Quickie P222se - 60Ah ADD ON
Quickie S646se - 150Ah LifePo4
Quickie P220 - Indoor Chair
Bounder Plus - 180Ah LifePo4
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Re: PINNED - Lithium battery conversion/info

Postby Gnomatic » 19 Nov 2017, 19:06

expresso wrote:thats great - big difference - - how did you do it - just spray over the pin and leave it alone ? both ends - let it dry and thats it ? i will get a can to have on hand - i could use that for other things also


Yep, gave both ends a good spray, let them dry, and connected.

do you cover your Dsub with those rubber covers you got ? dosnt hurt to spray every 6 months or say even if not having issues ?


I usually put the the cover on, but sometimes forget. I guess some dirt/dust must have got in there. Nothing looked corroded, but who knows? I'll take the results.
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 19 Nov 2017, 21:21

I use that DeOxit regularly, it keeps all contact points wetted. On PC slots and connectors, chairs, vans, all my RC helis, quadcopters, planes, rc plugs etc. etc. It helps! Also any rotating or sliding pots. Get in from the reverse side theres always gaps.
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Re: PINNED - Lithium battery conversion/info

Postby Gnomatic » 20 Nov 2017, 03:36

Burgerman wrote:I use that DeOxit regularly, it keeps all contact points wetted. On PC slots and connectors, chairs, vans, all my RC helis, quadcopters, planes, rc plugs etc. etc. It helps! Also any rotating or sliding pots. Get in from the reverse side theres always gaps.


It was certainly helpful in the situation I had! I imagine I'll find other uses too. :thumbup:
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Re: PINNED - Lithium battery conversion/info

Postby arikimau » 21 Nov 2017, 16:50

Hi. Sourced a donor F55 and been finding folk who can weld, paint and whatever

So. as I am about to go and buy lithium batteries, therefore my question is

what is the latest advice on battery spec

where to get them (plus battery holder/charger) from

It is early California time so haven't contacted batteryspace as yet

but would a UK supplier be simpler (re hazardous transport)

as a non techie any and every suggestion is welcomed
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 21 Nov 2017, 16:53

batteryspace


Run away. The first thing they will advise, is a BMS! And a dumb charger. Which might work, short term, if you are lucky...

Read the first few posts in this thread carefully. viewtopic.php?f=2&t=1813

Then speed read the rest.
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 22 Nov 2017, 02:37

First cycle of these one year left in the tub 9P8S .

Down to first cell hit 3.09V , and recharge , putting back 131Ah .
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 22 Nov 2017, 03:25

not bad for a year. And 14.5Ah for the worst cells in the group.
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 22 Nov 2017, 04:29

A bit disappointed actually , when compared to my lot . Page 82.

Wish it some improvement after cycles . :dirtbike :bounce
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 22 Nov 2017, 06:35

here: viewtopic.php?f=2&t=1813&start=1620 ?

Are they 15Ah cells?
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 22 Nov 2017, 08:52

Right . 40152 cells acquired same time last year .

We didn't screen them before assembly , so it's not regular as we grouped them at will .

Here is the last hour of discharge .

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