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Hertog posted:

Hi everybody! :) Today I picked up my C5 and I am totally happy with, except 1 thing.. The previous owner used the wrong battery on it. He used a car starting battery, so after 3 kilometers the battery is empty :( So I am thinking about replacing that ;) My thought was the following : Using a BMS like : http://www.ebay.com/itm/12V-14-6V-30A-LiFePo4-Battery-BMS-LFP-PCM-SMT-System-4S-eBike-battery-Pack-DIY-/321046261305?pt=LH_DefaultDomain_0&hash=item4abfd92e39 And 10 of those batteries in parallel : http://www.alibaba.com/product-detail/12v-5000mah-IFR32900-lipo4-battery-pack_1464884215.html Or a batteries like : http://www.alibaba.com/product-detail/3-3V-A123-LiPo4-Battery-Cell_712633139.html?s=p About, the batteries. It gonna be a construction where I get 12V and 50A out of it. That is my goal! Any thoughts on it ?
posted on: 26/05/2014 21:49:14

Dan posted:

You should get more than 3 KM from a decent car battery?  But you're right car batteries are not the best batteries to be used in a C5, high capacity leisure batteries would be better.

50amp lipo battery will be great, you'll have to let us know the performance you get out of it.
posted on: 27/05/2014 17:17:22

Hertog posted:

[quote=Dan;3461]You should get more than 3 KM from a decent car battery?  But you're right car batteries are not the best batteries to be used in a C5, high capacity leisure batteries would be better.

50amp lipo battery will be great, you'll have to let us know the performance you get out of it.[/quote] The seller told me the battery was fully charged and I needed cycle about 14 Km to the first train station. 3 Km further, the battery was dead :( So i had to cycle the last 11 Km manually wasn't very funny [angry] True leisure batteries would be better. The idea is to use LiPo4. I already managed to get a Chinese supplier to send me 14 batteries of 12V each with a capacity of 5Ah each. So that would mean a capacity of 70Ah at max. But I am not gonna use al 14 of them for 1 battery, I will probably leave the last 4 as spare. Just in case Now I just need a BMS and a good charger and I would be good to go..
posted on: 27/05/2014 21:37:19

Dan posted:

Yep that sounds good, I couldn't recommend using lifepo batteries more. I run on a 60ah one made by ping battery and it lasts forever and weighs a fraction of the big car batteries
posted on: 28/05/2014 18:06:48

Hertog posted:

LiFePO is just a big improvement over lead.. Yesterday I had some "fun" with the replacement battery, I got with my Sinclair. It's a "Calcium" with a capacity of 44Ah . I tried charging it with the original 3.2A charger, after a few hours the charger says it's "full" and then I tried to ride a few km on it.. After about 4ish Km its done.. Battery is empty :(
posted on: 29/05/2014 08:34:37

C5mick posted:

I will have to get my head round this km malarkey, what's the conversion factor ?
posted on: 30/05/2014 07:46:10

rekooh99 posted:

Divide by 8 and multiply by 5
posted on: 30/05/2014 09:12:20

andries.moss posted:

1.6km to 1 mile. Or 100 kph = 60 mph. 160kph = 100 mph. Not exact to the km but easy to work out from that. Did my head in when I first moved to the continent.
posted on: 30/05/2014 19:33:13