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06-05-2020, 05:46 AM   #1
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Pentax D-Li109 battery for the K-30 - has anyone else had this happen?

See the photos - this genuine Pentax D-Li109 was bought with my K-30 and dates from 2012, and has been working fine in that body and now in the K-70.

It needed charging a couple of days ago, and so I put it in the Pentax charging cradle and left it overnight to charge (didn't need that long, just forgot about it) - but when I went to remove it from the cradle, the top cover just "came off in my hand"!

Inside, it looked OK with no bulges or leaks, so I took several shots as a record and then superglued the top cover back on again!

Anyone else seen something similar?

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06-05-2020, 07:32 AM   #2
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It probably got too hot. Nevertheless you should keep an eye on it next time you charge it.
06-05-2020, 07:48 AM   #3
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QuoteOriginally posted by sergysergy Quote
It probably got too hot. Nevertheless you should keep an eye on it next time you charge it.
If it did get to hot, it means that the charger is not properly working. After an amount of time the charger ought to automatically switch off if the battery is fully charged. If it did not, than the charger is at fault. Moreover, I have never noticed that any charger of Pentax overheats nor that the battery being charged got overheated.

Last edited by Unregistered User; 06-05-2020 at 01:00 PM. Reason: typo
06-05-2020, 09:28 AM   #4
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Old batteries can get hot. The ancient battery for my K10D gets very hot where as a new old stock one doesn't get very hot at all. The old battery may take 4+ hours to charge while the new one takes the spec'ed 1.5-2 hrs.

As batteries age the internal impedance increases which translates to more heat while charging. The chargers look for a voltage spike that signals when the battery is charged. If the internal resistance gets too high the voltage spike may not get output.

06-05-2020, 10:55 AM   #5
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Thanks for the replies, guys.

This is almost the oldest Pentax battery I have (I've still got an older D-Li90 that came with the K-5), and has probably been charged many times - so, from what you said, this might not be a surprising thing to happen.

Will keep an eye, and a finger (!), on it the next time it is being charged to see if it does get hot (might even use a temp probe if the heating seems significant).
06-05-2020, 11:46 AM   #6
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Take a very careful look for any leakage! If that gook gets inside the camera, it can corrode things. Unless it is just a reflection, there appears to be something white (powdery?) at the bottom in your last picture.
06-05-2020, 01:12 PM   #7
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QuoteOriginally posted by AstroDave Quote
Take a very careful look for any leakage! If that gook gets inside the camera, it can corrode things. Unless it is just a reflection, there appears to be something white (powdery?) at the bottom in your last picture.
Might be traces of glue. That is perhaps the reason that the housing of the battery came loose because of warmth.
06-05-2020, 02:10 PM   #8
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@AstroDave - as I said earlier, there were (definitely!) no signs of any leakage from the cells.

@AfterPentax: looking fairly closely at the joints between the two sections of the case, there was little, if any, evidence of "tearing" of the edges of either - so I'm inclined to think that the original jointing compound just failed due to an inadequate amount having been applied in the first place, and/or age-related degradation over the last 8 yrs.

06-05-2020, 04:21 PM   #9
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QuoteOriginally posted by jeallen01 Quote
I'm inclined to think that the original jointing compound just failed due to an inadequate amount having been applied in the first place, and/or age-related degradation over the last 8 yrs.
That would be my guess. I've had all sorts of plastic items come undone due to regular use over a period of time. I simply re-glue and carry on.
06-05-2020, 07:15 PM   #10
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When I got my K-30 a few years ago, the original battery was so fat it wouldn't fit in the camera. It also came with two aftermarket batteries, one of which was in the same state and the other looked fine but wouldn't take a charge. My solution was to get an AA battery adapter and not look back. One of the best $3 investments I ever made for a camera.
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