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Thanks to those on this post that gave me advice on what to do with the batteries. I finished the e-kart and it worked well. Needs some tweaks on the kart but the Lion batteries were great. Here's a time-lapse video in case you're interested:

Thanks. I checked each battery and made sure the strips I was using could handle the high current. Looking forward to seeing how it all goes.

This is what I ended up doing. I used 18650 batteries to make a 20s6p with a BMS. Seems to be working fine but haven't finished the kart yet so no chance to properly test it yet.

Thanks 174. I've just come back to this thread from last week. Helpful advice and convinced me to go with lithium ions instead of playing around with lipos to start with. I think the learning curve is easier! Hopefully mine will come next week and I can start making up the battery bank.

Thanks 174. Its good advice. I'll definitely look at lithium-ion again with the 18650 packs as alternative to the HK packs. And definitely food for thought from you too Functional Artist. I am on a learning curve with batteries and the SLA batteries would definitely be the easier/cheaper...

Thanks EpsilonZero. And it looks like my manager is happy for me to invest in the lithium packs instead of SLA which is great. So now I probably needs some advice on which hobbyking battery packs to build the bank. Would this be a good option. 4s x 5 in series to get to 72V (5ah) - Hobbyking...

Thanks 174. I've been reading your post again and searching for 36V packs to cost them up. As far as I can see it works out at least twice as costly (but maybe that's just here in the UK!) using lithium packs. I going to price up the alternatives to see if my school will buy them! So i think my...

Thanks 174. I would much prefer a Li pack. They're just so expensive - maybe double the cost. I even thought about making my own with 18650. Definitely going to use the XT-90 spark connectors. They look good.

Thanks EpsilonZero. I was looking at SLA because of the cost of lipo but I'm just checking hobby king again. If I took your example or say this 4S one, I could put 5 in series. But am I not right in thinking I would need to add another row in parallel to take it up to at least 10ah instead of 5...

I'm just picking this thread up again as I am embarking on a similar project and would love some advice picking the right batteries. I am buying a 72V 3000W electric motor (MY1020 as often seen on eBay) to build an electric go kart in a school workshop with some students. I understand wiring...