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Sony a9 battery leak

  
 
Nifty Fifty
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p.2 #1 · Sony a9 battery leak


EB-1 wrote:
My oldest NP-FZ100 were from 2017 and they worked fine 5.5 years from mfg. date compared with overlaid disharge curves of new batteries.


I'm curious to see how the practice, common for several years now due to legal regulations, of selling batteries empty rather than half-charged, will affect battery lifespan. I fear this practice will lead to a noticeably shorter lifespan.



Mar 30, 2026 at 06:48 AM
mt-m
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p.2 #2 · Sony a9 battery leak


EB-1 wrote:
Melting is thermal and dissolving is chemical. Did you send the camera in for service?

EBH


Not yet, just made initial contact.



Mar 30, 2026 at 06:58 AM
Altglas
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p.2 #3 · Sony a9 battery leak


I think Sony's reaction will be influenced by legal aspects. It wouldn't harm them to replace camera and battery on their cost but they will be careful not to give the impression that it would be their duty to do so.

These lithium batteries can do unexpected things. I actually had a case where a lithium primary cell started to burn without influence from outside. A very tackling woman solved the Problem...



Mar 30, 2026 at 07:37 AM
EB-1
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p.2 #4 · Sony a9 battery leak


Nifty Fifty wrote:
I'm curious to see how the practice, common for several years now due to legal regulations, of selling batteries empty rather than half-charged, will affect battery lifespan. I fear this practice will lead to a noticeably shorter lifespan.


They are not really empty. Below a certain voltage the BMS goes to a high impedance state so they are good for a while without charging, but it would be better if they were half charged or around that.
I don't know Sony before 2017, but Canon battery packs have been sold in a discharged state for 15+ years.

EBH



Mar 30, 2026 at 09:34 AM
mt-m
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p.2 #5 · Sony a9 battery leak


So, an update for those curious:

Sony told me to send the camera and the battery to Precision Camera. After a few weeks in "Engineering Delay" I finally get an email from them with an invoice for $1,119.33 that says this:
"Technician Findings:
Suggest replacement Battery
Chamber, Battery Lid, Front Grip,
Grip adhesives
Battery leaked in chamber, Grips are
peeling"

Notice the "battery leaked in chamber" part.

A few hours later, both Sony and Precision Camera claim that the battery DID NOT leak, and the damage must have come from outside.



Apr 29, 2026 at 07:24 PM
EB-1
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p.2 #6 · Sony a9 battery leak


That seems like a high cost for not really replacing anything internal. I'd probably clean it up myself and keep using it. How much is the camera worth at this point?

EBH



Apr 29, 2026 at 10:11 PM
 


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ramesesthe2nd
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p.2 #7 · Sony a9 battery leak


Definitely not worth over $1,100 to repair A9. Just try to fix it yourself. If you fail, you can buy another A9 for about the same price.


Apr 29, 2026 at 10:24 PM
schlotz
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p.2 #8 · Sony a9 battery leak


Yup, agree it's not worth the repair cost vs buying a replacement. I'd suggest the OP go into their profile here on FM and add Sony A9 to a watch list (at the bottom) to get notified when one becomes available in the Buy&Sell forum. BTW: it looks like there are two still available for sale right now.


Apr 30, 2026 at 06:02 AM
mt-m
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p.2 #9 · Sony a9 battery leak


Yes, will try to clean/fix what I can myself.

Oh, and Precision Camera wants $98 "refusal estimate" to send it back to me. $35 diagnostic fee and $63 shipping.

I am not impressed with Sony's customer service.



Apr 30, 2026 at 07:16 AM
schlotz
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p.2 #10 · Sony a9 battery leak


Never a free lunch... argh!


Apr 30, 2026 at 08:31 AM
jowul
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p.2 #11 · Sony a9 battery leak


Wow. maybe a fake Sony battery? I use OEM Sony batteries as well as reputable third party batteries and have never had such an issue


Apr 30, 2026 at 10:12 PM
mt-m
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p.2 #12 · Sony a9 battery leak


jowul wrote:
Wow. maybe a fake Sony battery? I use OEM Sony batteries as well as reputable third party batteries and have never had such an issue


No, genuine Sony battery.



May 01, 2026 at 07:13 AM
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