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  1. C

    Smart Pie 4 and NMC 24V 20Ah Battery

    No tesla purposely avoided NMC because of the poor calendar life. They choosen NCA instead, which are the ncr18650 range cells
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    Frame battery pack docking and undocking space?

    Anyone know something similar but accepting 100 cells? 52 does seem low for me
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    Dahon Jetstream conversion

    this one does seem even simpler: http://www.aliexpress.com/item/Mountain-bike-stem-lengthen-riser-increased-device-elevator-riser-elevator-20/1540934804.html but may not make my bike very appealing. But thinking about it.. It would be perfect for folding ability. And construction does seem...
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    Dahon Jetstream conversion

    Ok, in kudos website they are selling their folding steam handlebar: http://www.kudoscycles.com/product_info.php?cPath=2_3_24&products_id=281 Any risk it may not be compatible or can I buy it?
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    Dahon Jetstream conversion

    The folding handlebar is broken, I need another one: I sliced it up hoping to be able to fit the handlebar on it but it was too large :( Any idea where I could find a cheap compatible folding handlebar?
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    Dahon Jetstream conversion

    Back to track!! So fork and wheel have been received! It does seem to fit well, although I'd have to admit if suspension were a bit higher it would be a problem: The bottom part of the fork has the bearing: It does seem to fit well: The top part too but seem a bit more loose:
  7. C

    Making a lightbulb discharger

    yes but 200w only, I'd need to buy 5 to achieve 1000W so back to £40 expense And they need fan too. So additional expense. I was thinking lightbulb may be more convenient/cheaper
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    Making a lightbulb discharger

    I think I found out the solution, although not as cheap as I'd like: - Buy 3 of these, so 9 x 100w lightbulb: http://www.ebay.co.uk/itm/X3-100W-ES-PEARL-48V-50V-GLS-LAMP-LIGHT-BULB-LOW-VOLTAGE-/140874761935?pt=UK_Light_Bulbs&hash=item20ccca46cf - And these holder...
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    Making a lightbulb discharger

    Is there a simple way for me... to either discharge at 50W or 1000W for my 48V battery? I need to either test at low discharge while creating a pack, then high discharge when the pack is finished
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    Making a lightbulb discharger

    Thanks d8veh, again you have an excellent idea. I found this: http://www.ebay.co.uk/itm/Nichrome-Wire-Resistance-Nickel-Chrome-Heating-Element-Hot-Cutting-Various-Sizes-/251550106470?pt=LH_DefaultDomain_3&var=&hash=item3a918e0366 It's cheap and good.. and with a resistance table! The smallest...
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    Making a lightbulb discharger

    Thanks I didn't noticed the resistors. But it's going to be way more expensive than my lightbulb option and customs are going to hit me hard when they'll find these big resistors also. The big benefit of this tool is that it can have a low voltage cut off
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    Making a lightbulb discharger

    I think I've found my answer: http://www.practicalmachinist.com/vb/general/120v-bulbs-dc-148591/index2.html - AC lightbulb use the same power whether it's on AC or DC. - So I=P/V = 200W/200V = 0.9I. - P = V*I = 48V*0.9I= 43.2W. So each lightbulb would discharge at 43W. If I want to discharge...
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    Making a lightbulb discharger

    That doesn't solve my problem. I need to find the right resistance for my need. Lighbulb are resistance but I don't know how much. This tool still need to attach resistance to it.
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    Making a lightbulb discharger

    Hello, I'd like to make a lightbulb discharger to easily check the "healthyness" of my batteries. I found these 200W lightbulb: http://www.ebay.co.uk/itm/GLS-Pearl-Bulbs-100W-150W-200W-In-Bayonet-B22-Edison-Screw-E27-Cap-Fitting-/281316289122?pt=UK_Light_Bulbs&var=&hash=item417fc1ea62 And...
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    72V 20AH battery for £290

    Bestek power 40A bms
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    72V 20AH battery for £290

    Yup you won't find quality big battery for that cost anywhere else
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    72V 20AH battery for £290

    Yes postage an option. Initial price was £350 but I can reduce it to £330. Just the Bms is £50. And I have 2 type of charger: Either with fan (from bmsbattery) or fanless (but bigger and more DIY).
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    rebuilding a battery

    but it won't be quick release anymore!
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    Broken spokes!! Need quick fix

    They are quite inside. But only on 1 side not the other.... Ok I'm going to buy the 288mm model then
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    Broken spokes!! Need quick fix

    They don't have 290mm, shall I still get the 288mm or 292mm?