Extending Device Battery Charge

I am confused about what you are proposing. Aren't you doing the same thing as one of these power banks but using a power tool battery instead?

The solar cells of this particular bank seem to me to be an interesting addition. Solar irradiance varies widely by location and weather. So, I understand not mentioning solar charging times but "topping off" with just solar power seems like a good idea to me.

I do not own this or any other power bank.

Aren't you doing the same thing as one of these power banks but using a power tool battery instead?

Yes.

And, maybe I’m out of the current loop (that there is an exceptional pun intended, or a Magnum P.I.) on state of the art power banks. The four, five, maybe six powerbanks in residence at chez Doorman (purchased by Mrs Doorman to resolve her same issue) all offer (in my opinion) woeful performance, measured in single digit hours of extra device life, not the 200 odd hours cited.

I like the solar option.

This thread isn’t necessarily intended to lobby in favor of this tool battery scheme. This can be kind of expensive. I already have batteries and chargers, so this only cost me $7.50 USD for the adapter.

I understand that the image you included was simply a paradigm. The customer reviews for the Solar Power Bank 36800mAh Portable Solar Charger 5V3.1A, QC 3.0 Dual 2 USB say the power bank charged a phone between one and four times, then pooped out. So, this particular power bank - except for the solar charge thing - is about like the ones that Mrs Doorman has purchased, maybe a little better. Not a real standout performer, but it’s also only $20 bucks USD.

I’ll look around on the ‘net and see if I can find a better contender.

Another thing that occurs to me about all those power banks that I have stored in drawers is the charge time. IIRC, it takes four or five hours to charge one of those things up. A DeWALT DCB240 battery runs my old and inefficient phone for a week @ 24 hrs/day, and charges back to 100% in about 50 minutes.

I have several of those portable power packs, they just don't work well, too slow....I have a wireless charger by my desk and use the charger in the car when on the road...so never found a use for them...For extended use I also have a 12v battery pack for jumpstarting the car, and several battery backup UPS with UBS, so yeah, I'm covered...I might consider something like this...

For off grid day tripping...possibly adding the solar panel add-on option...

Many of the threads pleading for helpful advice on this subject seemed to be from younger people, and many of those posters seemed to be ESL. I cannot recall anyone ever specifying a root reason for a need of extended battery life, but unpredictable mains would certainly be a valid reason.

USB power ports seem to be on everything anymore. At least one tool and battery manufacturer puts one right in the battery! I’m sort of surprised toy model train transformers don’t have a USB port or two... yet. The next generation of train transformers from all major players will almost certainly have them.

Combination water supply, phone charger and 5v supply backpack...$70

Is that a Radio Shack logo on his shoulder? I thought they were defunct.

Well, in the Radio Shack logo that I remember the letter ‘R’ is not centered in the circle.

But the hip of the shorts... looks like Radio Shack might be there.

Backtrack the image, go through the slideshow, and we have

Vintage geek wear?

Also reduces insolation of the wearer's back.

Test.

I’m getting a Cloudfare error.

Test.

My flip phone will stay on mostly stand-by for several days, so I don't need the extended power supply. I don't use it much for yakking, and never the internet. The old laptop battery will provide several hours, that is all I need.

This is an "unnecessary" post, because "subscribe" is not working, and a post should do it!