2 x 5000 mAh batteries for uConsole

uConsole
1

Hello there!

Guys, I have an idea to install two 5000Mah batteries inside UConsole instead of two 18650. I’ve found this battery on Aliexpress https://aliexpress.ru/item/1005008299182248.html?sku_id=12000044538707858. I think I can stack two batteries vertically and connect them in parallel. If it will not fit in the case I can simply reprint my case with more vertical space.

My question is how to connect them to the board? I have an AIO v2 board with NVMe extension, and there is a connection port. Should I solder batteries wires together (plus to plus and minus to minus) and connect it to the existing port OR solder each battery to the 18650 solder points on the board? My concern with the last option is that the batteries will be charged unbalanced.

board
board962×869 167 KB

board2
board2962×869 168 KB

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I too am doing this just waiting on the parts I will be using a adapter to connect x2 10,000Mah for testing .

Adapter I just found this on AliExpress:
Graphics Card Fan Cable GPU PH2.0 Mini 2/3/4Pin To 2 Way CPU 2/3/4Pin PWM Fan Connector Cable Lead Y Splitter Split Two Fan Line

Battery I just found this on AliExpress:
9858102 High Capacity 10000mah 3.7V Battery+PCB Protection Board Rechargeable Flat Battery Laptop Batteries Power Bank

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So you’ve chosen the first option? Are you sure that batteries will charge/discharge evenly?

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The second option the adapter will plug directly into the battery connectors using the splitter. This is a test so not sure its gonna work or not but I will post my results here.

5

Maybe @vileer can provide information about charging?

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Both ways would work.

3 Likes
7

the charging circuitry is on the mainboard, and it can only handle a single cell, so the mainboard also puts the 2 original cells in parallel

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So it cannot balance two batteries right?

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when you’re using batteries in parallel there’s no such thing as “balancing”. Only batteries in series need balancing.

Case you need balancing:

(3.7v + 3.7v in series) 7.4v → Protection Board (Battery Management System) → buck converter → 5v → Power Management Unit on motherboard

uConsole:

3.7v in parallel → AXP228 Power Management Unit

1 Like
10

Batteries in parallel self balance, which is why it’s important to have both batteries in the same state of charge when first connected together. Because if they’re not large currents will flow between the batteries.
So before you connect the batteries together you should fully charge both of them individually

2 Likes
11

Best way is charge both one at a time in uconsole once both fully charged they can both be connected this is what I will test. The test will be with x2 10,000Mah batteries.

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Got my batteries today. Going to test it now.

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Tested, 2x5000mah can provide 31.5 Whr. Less than what I expected lol. That was under a constant medium load.

With extra low load (e.g., screen off, nothing running), it reached 33.4whr. Not bad but not impressive either. However I noticed that the shutoff voltage is higher this time, it gave up at 3.38v. Although, the axp228 is still surviving, it’s the system that’s giving up.

1 Like
14

Does it mean “better” or “worse”? My shutoff voltage is near 3.4V with 2x18650 Samsung 30Q

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I think it’s not too bad… as it’s more graceful than going below 3.2v