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Good info. Thanks. For some lighting applications that I have developed, my needs are for a 9V battery pack. Six 1.5V alkaline cells work great but when batteries are spent, I would either have to have battery pack returned to me or expect consumer to make up cost of battery pack enclosure, switch and other hardware, and assembly labor cost. My current solution is to use a larger enclosure to house 8 NIMH AA cells. Presently I am not marketing any of my devices. Hopefully I will at some point. I prefer to develop and test a product and prove its performance prior to marketing. Software is a good example of release date panic. "Release it today and we'll patch it as we can." Pretty sure that was the case on the MAX737 catastrophes. Praise be to the almighty dollar? Not my belief set. That is unpopular in corporate thinking, but hey, I'm retired.Standard alkaline cells are not rechargeable. Forget the promises of dubious manufacturers.
You an buy special rechargeable alkaline cells. I have never used them. Wherever I made such heavy use of batteries that I wanted rechargeables, I used first NiCd, later NiMh (which I'm still using) with good results.
Lately I started using LiIon 18650 cells salvaged from electronic devices. Of course with their 3.6 V output these are not a 1:1 replacement for the typically used AA or AAA cell. But with an inexpensice adapter module these cells make super simple 5 V power banks for all kind of electronic DIY stuff.
Why would that be? None of my battery operated devices has such an option. It is usually up to the user to replace batteries. A battery holder will be needed anyway, so will probably an on/off switch. So there is no additional cost in these components.when batteries are spent, I would either have to have battery pack returned to me or expect consumer to make up cost of battery pack enclosure, switch and other hardware, and assembly labor cost.
Both the charging modules and converter modules are nicely priced. Thanks.Why would that be? None of my battery operated devices has such an option. It is usually up to the user to replace batteries. A battery holder will be needed anyway, so will probably an on/off switch. So there is no additional cost in these components.
Alternatively consider this setup which I am using in a similar form:
The user is now able to charge the device using a standard USB charger through the micro USB port (which has to be located conveniently) without the need to open the device or replace batteries. Plus the power supply will be at a stable 9 V (or any other voltage you set the boost controller up to) as long as the 18650 cell is charged.
- LiIon charger module with micro USB input to charge 2.
- 18650 LiIon battery for energy storage.
- Boost converter module to generate 9 V from the LiIon battery's 3.6 V.
Not at all. They were available at no extra cost and work fine.Any particular reason that you use salvaged LiIon cells?