I have a small travel router based on a Raspberry Pi. I want to 3D print a case for it. I’d like to find a commerically-available battery (ideally in a somewhat standard form factor so I can replace it down the road if I need to).
I could use something like 18650s, but they’re not very efficient in terms of energy per square inch.
Does anybody know of a good battery that would work for this?
maybe an old drill battery if you have one of those cordless power drills
I’d honestly recommend getting something like a standard power bank. Anker makes decent stuff. The amount of work/effort to make the a battery with a circuit board will probably not be worth the effort.
Probably a drone battery. They’re just the cells and as little plastic as needed to hold them together because drones are all about being small and light. They come in a pretty wide range of sizes and cell configurations.
You can pair it with a little switch-mode regulator to get 5v power.
I’ll second the drone/RC LiPo packs. They are made for high energy density per unit of weight. They typically put the battery management on the charger side. I would making certain there is some sort of short circuit protection, and many cheap fuses won’t blow until current has gone too high for too long relative to their rating.
I would also find a charger that can be adjusted and use a more moderate charging current, perhaps 1/2 to 1/3 the max rated charging current. It’s too dangerous to me to be doing things like charging to higher voltages than 4.2V per cell and pushing the limits of charging current, as this usually leads to spicy pillows.
I won’t support them for lying euphy security cameras not sending data to the cloud
I got this after seeing them as sponsor on ltt.
Performance is great while traveling and fits very snugly within the battery bank of the LTT backpack. It is good enough to power my laptop while in use and charge my steam deck. Looking back I should have done a bit more research, but I got it a week before leaving on a trip.
I’d check project farms
His personal pick was iniu b61
If you want something smaller and want to give Louis Rossmann money, you maybe pick one up from his store
I have several Anker power banks, but I really want an all-in-one unit that doesn’t have to have a separate device tethered to it.
To achieve the highest power for the space you take up, you need to go pouch cells, which means nonstandard. I saw you mentioned that you would like built in goodies to make these not blow up, so I would suggest simply buying a cheap battery pack from a reputable company that uses pouch cells.
If you are 3-d printing a case then you can just add a slot/space for the battery bank. It’ll make it a little more bulky. But it allows you to have everything all-in-one and you can easily use the power bank for other purposes when the router isn’t in use/needed. Also makes it easier to maintain the health of the battery pack.
or get a single dense battery cell that will last a while, then boost the output to what you need. This battery cell should last you a while at 314AH.
Yeah, and it can also melt a wrench placed between the terminals. 
EVE also manufactures 50 and 30Ah(?) prismatic cells. One of those would be much more reasonable than lugging around a brick-sized battery with you.
Although, if the OP wants to travel via airline, you need to consider the maximum legal capacity.
For LFP it’s: 100Wh / 3.2V = ~31Ah,
and for traditional Li-Ion it’s: 100Wh / 3.7V = ~27Ah.
You’d also want to add a battery protection circuit to prevent “oopsies” from happening. 
My wife uses a power wheelchair that has 300wh of LFP batteries. The form at the airport only lists lithium ion, lead acid wet, lead acid gel, and dry cell. Since her chair does not use any of the options on the list, they always insist I choose something, so I always choose dry cell, and they let me proceed.
I should note that the batteries are located inside one of the frame rails on her chair and that anything that damaged them would first have to pierce about 2mm of aluminum.
Anker has a recall be careful.
We have discovered that some of the lithium-ion batteries used in our Anker 334 MagGo Battery (PowerCore 10K), Anker Power Bank and Anker MagGo Power Bank may pose a fire risk due to a manufacturing defect. The lithium-ion battery in the affected powerbanks can overheat, potentially causing melting of plastic components, smoke and fire hazards.
Anker has a recall every 2 weeks… Seems like the desire to design a new product every 36 hours, communist slave labor, and unstable elements like lithium don’t mix…
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