My 12S10P 8C li-ion battery setup


Wanted to share my battery build and get the forum’s advise on the general electronics setup.
I’ll start with the battery and ask the questions in different posts within this thread.

First, I didn’t build the battery, a friend of mine did. It’s his day job, anything involving li-ion packs, from e-bicycle to esk8, RC, etc.

The specs:
12S10P SAMSUNG 18650 25R.
The cells each contain 2.5AH, and are rated 8C (!). This means that I can discharge at 2.5 * 10 * 8 = 200A which should be more than enough for our task.

Dimensions: 20.5 x 24.5 x 7 cm.
Weight: 5850 grams.

I’m using a BMS only for charging, and I asked for a special BMS that allows charging at 15A
I’m going to use this 15A charger, assuming it will go through customs. This should allow me to charge in less than 1.5 hours, which should be nice.

Some pictures:

I’m going to fit the battery into this box (link, sorry for the local shop link). It weights 2200 grams and it is IP67 water resistant.


I followed the instructions from @pacificmeister and others in the forum, and bought a lot of equipment for installing between the battery and the motor:

  • ESC (Hobbywing Seaking 130A, da…)
  • Self priming water pump
  • Amp meter
  • Temperature sensor
  • Circuit breaker
  • RC receiver
  • 5V BEC that works on 12S
  • 12V BEC (for pump) that works on 12S (I’m actually still looking for one :slight_smile:)

I also got a small waterproof box with transparent top.

My biggest dilemmas are:

  • Should I mount everything in the same box (with the battery), or should I have a different box just for the ESC (and the two BECs, RC receiver, water pump, temperature sensor)?
  • Should I transform the battery box so it has a window on top? I think I can do that by cutting a square hole on the top, and gluing a plexiglass sheet on top, keeping it tight to the box with screws.
  • How do I mount the circuit break? It cuts the circuit when pressing on this button, but how can I make this button accessible quickly and safely? Can I mount it outside the box? I know it is waterproof, but still,… salty water??

Some pictures of the equipment:


I am putting the ESC separate. This is the most likely part to explode or get wet.

For the e-stop I use an albright relay for electric forklifts.


Do you mind me asking a price tag on that bad boy ?


Sure, the battery cost was 840 USD (2900 NIS), including the beefy BMS.

As always, much more expensive than any lipo solution.


Usd ? Still not bad for quality cells


yes 10char10chars10chars