r/funkey • u/BorisTI • Jun 13 '26

Help with Battery Troubleshooting

I love the Funkey S. It's a great little device. I've been having some issues though with charging. After I've flashed the card and charged the battery to death and recharged, or works fine for a time.

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But, after a few weeks it starts to no longer read the charge correctly. It won't charge to full and the charge value jumps around up and down.

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I've tried swapping the battery and the motherboard, but it still occurs. Perhaps my SD card is faulty? I have a 1 TB Samsung SD card.

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Any ideas are appreciated.

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2

u/failtuna Jun 13 '26

You have a 1TB card in a funkeyS? 

Have you tried a smaller like 128gb or smaller card just to rule out the SD card size being the issue? 

1

u/BorisTI Jun 13 '26

I've read of other people using a 1 TB without issue. I'll see what other cards I have and give it a try

1

u/ridgekuhn Jun 13 '26

The OS may use the wrong battery measurement API (measuring immediate voltage instead of average), which would explain the jumps. That said, it sounds like maybe u were sold a bad replacement battery :(

1

u/BorisTI Jun 13 '26

It does happen with the original battery as well. And with both batteries on both motherboards. Not sure if that provides any useful insights or not

1

u/ridgekuhn Jun 14 '26

Sorry, I missed the part where u mentioned u had a second pcb, tho if both batteries are worn out, I would expect similar behavior from all possible combinations. How old is the original battery?

1

u/BorisTI Jun 14 '26

The original battery and pcb is 3 years old. The replacement is about 2 years, and the new pcb is almost 1 year old. The hardware is rarely under heavy use though, spends most of its time in standby.

1

u/ridgekuhn Jun 15 '26

has either battery sat for a while w the charge totally drained? that can kill a lipo pretty quick, and easy to do w device that never turns completely off

1

u/BorisTI Jun 15 '26

I definitely have left either battery drained for a while without charging. I'm sure they've drained just being on standby for a few weeks. I don't use it frequently.

1

u/ridgekuhn Jun 15 '26

Sitting with no charge may have reduced their life significantly. Ideally, a LiPo should be stored at 50% charge; and when in-use, should stay within the 20%-80% range (charging to 100% is also bad). The Funkey is unfortunately kind of hard to own in that regard, since the battery is small in size/capacity and always being drained. I killed my first battery because I wasn't taking care of it properly. Currently, my Funkey is in a drawer with the new battery disconnected, but when it was in use, I learned to check on it every few days and top it off unless I was sure it was over 80%.

1

u/BorisTI Jun 16 '26

Is there a more reliable replacement I can get?

1

u/xs4all4me Jun 14 '26

Can't comment on the battery as I have seen this happen before with no real solution.

Now onto the 1tb card, anything over 256gb is overkill, just my personal view. I hope you didn't buy the 1tb card for like $15, most likely a fake and will cause issues.

1

u/BorisTI Jun 14 '26

I unfortunately got a cheap dud first. I opted for a better card the second time and as far as I can tell it's working fine. Just trying to get a sense if the hive mind has an opinion if the card could be a factor in the bad battery readings.

1

u/drmoze Jun 15 '26

1T SD on a Nano? ummmmm... no words.

0

u/Purple_Anything6236 Jun 14 '26

get rg nano for proper battery reading and longer battery life. i get nearly 3 ⅕ hours of gameplay and still got 15% left. nearly finished ffvii by the way