There is no protection when you’re charging a pack like @Foxyirish1987 describes above. Very dangerous. There is no individual cell voltage monitoring or protection. Just dumb luck keeping it from exploding. Sooner or later luck runs out.
Be safe guys. These batteries must be treated carefully.
Key words. “Balance charge” your lithium batteries!
This is also true which means body cannot close the circuit between - and + in case of water leak in the water unless user somehow touches both contacts and still if there is a path true salty water all current will flow from there
Exactly. Be smart. Use only one hand. 14s is up to 56v fully charged, so it’s on the line of dangerous. I wouldn’t got above 14s. But unless you are wet and touch positive with one hand and negative with the other completing the circuit…risk is low. In my opinion.
the connectors makes a big difference I am using amphenol high current connectors which no contacts are exposed and it is ip69 rated after mating 
Those are excellent connectors. I thought about buying some.
Did you get them from Mouser electronics?
You mind providing a link? It’s hard to tell what you are getting when you buy those from most of the websites I’ve seen.
I bought them from digikey. great connectors easy to work. We were using these on high end EV packs in my previous job. Expensive but it worth every pennies I payed for them.
I just spent the last 10 minutes on the website and I can’t find those connectors. Can you provide me a link please.
That is correct, you need to select them from catalog below are the part numbers and links from digikey
https://www.digikey.com/product-detail/en/amphenol-sine-systems-corp/ATHP041P08NN-H1-ORG/889-3483-ND/10129315
Also these for communication and others:
https://www.digikey.com/product-detail/en/amphenol-ltw/CBD-08AFMM-QR8F01/1754-1176-ND/7102780
https://www.digikey.com/product-detail/en/amphenol-ltw/CBD-08PMFS-QC8001/1754-1173-ND/7102777
Thank you!..
I doubt this optimistic approach. 12S is dangerous enough, why go further?
Lift wouldn’t be using 14s if it was that dangerous.
20V will kill you if it can push enough current through your body. The old anti-shark devices used to pulse at 125V but had a big power resistor in parallel so that they limited the current through the electrodes thereby making it impossible to electrocute you.
I do think the most sensible thing as a DIY community though is to look for a solid waterproof solution in order to make sure that the battery is at least IP67 rated. That combined with making sure you are dry before plugging in and unplugging the battery removes a huge amount of risk in getting a shock.
I have found some housings that can make a waterproof 12S6P pack, but have not had luck yet with 12S12P to 14S14P (the size needed for efoil). I do have an idea on how to try manufacture some on the cheap, but have not had a chance to try yet.
Maybe I will come to your rescue on the battery… Working on the test unit as we speak…!
Currently running 13s13p inside… Also should possible 12s14p or 14s12p
It’s ip67 (with connector mated).
I am not sure if I will offer the casing without pack but this idea is on the table… 
Working on few other things that DIY users will have access to… All this takes time so no commitment.
I think it’s also not bad idea to dip the all pack into isolating epoxy resin to add extra safety regarding water…
wow, looks promising. Any approx price?
No… It’s too early to talk about price…
It looks great!
If you don’t mind me asking, whats the housing made from? Is it drop proof?
What are the dimensions?
The sample we made is fiber filled nylon so it’s pretty impact resistant… Did some tests with hamering the edges and was still in one piece.
Only hamering the center could eventually damage the casing. It’s similar material used for the mast tracks of windsurfing boards. It’s also quite stiff.
