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Processor | i5-6600K |
---|---|
Motherboard | Asus Z170A |
Cooling | some cheap Cooler Master Hyper 103 or similar |
Memory | 16GB DDR4-2400 |
Video Card(s) | IGP |
Storage | Samsung 850 EVO 250GB |
Display(s) | 2x Oldell 24" 1920x1200 |
Case | Bitfenix Nova white windowless non-mesh |
Audio Device(s) | E-mu 1212m PCI |
Power Supply | Seasonic G-360 |
Mouse | Logitech Marble trackball, never had a mouse |
Keyboard | Key Tronic KT2000, no Win key because 1994 |
Software | Oldwin |
These aren't batteries with cylindrical cells, they are prismatic/pouch batteries. HP support page says [yes I know what the topic title is, and the answer is no, but still]:Ummm, sorry but no! It is not normal. There should never be any swelling. Swelling typically indicates the battery got too hot - never good. Excessive heat could have come from outside source (laptop left in a hot car, for example) damaging the battery. Not good. Or an internal, partial short in the battery caused excessive current which typically increases heat. Also not good.
Swollen battery is not a safety issue
A swollen battery does not present a safety issue. It is the result of the generation of gases per the normal degradation of the battery cell over time, which causes the battery to expand. HP has worked closely with our battery cell suppliers and third-party industry experts to help minimize the potential for HP batteries to swell over time and to identify that swollen batteries are not a safety issue.
Discontinue using a swollen battery
After you notice that your notebook has a swollen battery, immediately discontinue use of the notebook to protect your hardware. Be sure that you disconnect the notebook from AC power as well.
At Dell:
Discharge it: this one is important. Swelling is partly reversible, an empty battery has less gas pressure and apart from that, less energy to burn.Swollen battery may impact the performance of the laptop. To prevent possible further damage to the device enclosure or internal components leading to malfunction, discontinue the use of the laptop and discharge it by disconnecting the AC adapter and letting the battery drain.
And Lenovo:
Abnormal Battery Swelling
All lithium-polymer batteries exhibit a small amount of swelling during charge and discharge cycles. Swelling which leads to noticeable bulging of the battery pack or your system is abnormal. Abnormal swelling can occur for a number of reasons including: exposure to high temperature, extended time at full charge, extended cycling, over-discharge while in storage, or damage due to being dropped or deformed.
In most cases, a swollen battery which has resulted in mechanical damage to your system does not present a safety risk , as the swelling is primarily from harmless carbon dioxide (CO2) gas generation. However, in some rare instances, excessive swelling may lead to hazardous conditions.
The device case must be designed to accomodate for some swelling. One of the Samsung phones or Notes wasn't, which resulted in fires (even more fires than Li batteries would otherwise cause).
Unfortunately it's hard to know how much is too much, and manufacturers aren't really trying to make it clearer for us - you can also see that from the examples I cited. A Google picture search for "swollen lithium battery" will only show you extreme cases of bubble-like batteries, which I would only handle with a longest shovel and protective equipment.
Here's a source (Epec, a battery pack manufacturer) with at least some specific data.
Swelling can occur as part of gas generation. Battery manufacturers are at odds why this happens. A 5mm (0.2") battery in a hard shell can grow to 8mm (0.3"), more in a foil package.
To prevent swelling, the manufacturer adds excess film to create a “gas bag” outside the cell. During the first charge, gases escape into the gasbag, which is then cut off and the pack resealed as part of the finishing process. Expect some swelling on subsequent charges; 8 to 10 percent over 500 cycles is normal. Provision must be made in the battery compartment to allow for expansion. It is best not to stack pouch cells but to lay them flat side by side. Prevent sharp edges that could stress the pouch cell as they expand.
Anyways, I'd consider OP's battery unsafe, not least because the protective bag has partly detached from the plastic frame (at the left).