Battery Advice 10s5p 30Q

ESK8 Electronics
1

I’m going on vacation but won’t be able to bring my board with me :disappointed_relieved: I’ll be away for, give or take, 4 weeks.

How should I leave my batteries? Should I fully charge it before I go? Should it be disconnected from the ESCs? Is there a certain way of keeping it in storage safely? It’s a 10s5p 30q pack.

2

Id store it half full, off the charger, battery pack disconnected, and optimally the battery pack would be in a fireproof bag.

But then again we leave them connected to our boards regularly so I’d just do the first 3 suggestions if you don’t have a fireproof bag :slight_smile:

3

Ideally batteries shouldnt be stored full. Storing at about half charge is better

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4

The best is stored the battery’s around 3,45v each cell in a cool and dry space.

Disconnect the whole pack from everything. The ESC and antispark (if you use it) can drain the pack a bit.

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5

Store it at 3.5V disconnected from everything. If you have a good bms then you don’t even have to do that.

6

thats not true, always disconnect from esc and anti spark because some anti sparks draw 0.5 watts even when turned off, for ex the fatboy antispark

7

1 month is a pretty long time and your battery will probably drain to 0% if you store at around 3.5v, so id say store at 100%

8

1month is okay for a battery. I have cells who are laying here for more then 3 months. They where 3,45v. I think they are now 3,35v. Let me check it tommorow.

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9

cells will always last longer then a pack with a bms in it, even the bms draws power which can cause the pack to go flat

10

I know. But a bestechpower bms draws less then 50 micro ampere’s. So that is 0,00173watt

Edit: 3,45v is around 4wh. So a 10s5p would be 200wh. So 200wh/0,00173watt = 115 000 hours.

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11

yeah lol, all he needs to do is unplug from anti spark then because theirs a chance that will be the killer

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12

Yeps. Those antisparks and vesc can be a killer.

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13

@AlanZhou, I said a good BMS. So fatboy doesn’t count because it’s neither. Let’s take a Bestech BMS as an example. It says it takes 50uA(~ for 10S battery) current draw to function. Say you want to allocate 1Ah of your 10Ah battery to BMS, it’s going to last you 1Ah/50uA = 1,000,000/50 hours = 20,000 hours = 833.33 days. If you want to have a factor of safety of say 2,5, or even 10, you are good for 3 months. A little bit of math, helps :slight_smile: . Let me know if I have made calculation mistake somewhere.

http://www.bestechpower.com/37v10spcmbmspcbforli-ionli-polymerbatterypack/PCM-D105.html

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14

it sounded like you said if you had a good bms you wont have to unplug from an antispark

15

I meant one doesn’t have to unplug the battery from the BMS.

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16

Yeah I could see why that would make sense. All my packs have been shipped fully charged. I’m sure there’s a time table where it makes sense. Thanks for the correction!

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17

So general consensus is:

  • Charge/Discharge the pack to 3.45V per cell (34.5V) / half full
  • Disconnect from ESC and other devices that can discharge it
  • Keep in a cool dry place, preferrably in a fire proof pouch/bag/container

Thanks to everyone for your input.

18

Have you been using it regularly? Does it have a loopkey that disconnects everything? If the answers are both “Yes” then just ride it once to get it between 25% and 70% charge, and leave it. If they aren’t both “yes”, please elaborate.

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19

Yes, on average 80km / week for the past year or so. Yes, my setup is battery (no bms)-> loopkey (no anti-spark) -> ESCs

So just disconnect loopkey and that should take care of it?

20

I have a vtc6 10S5P pack and left it for about 5.5 weeks. I left it plugged into my unity and worried about that parasitic drain. Contacted Jeff (@Deodand) said don’t sweat it; it is designed for it.

6 weeks later I check my voltage and it didn’t drop at all… stayed steady at 36.7

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