As far as the basic physics, the 2000 mAh battery is going to have about 10% more capacity than an 1800 mAh battery with the identical 3.7V. For instance, you can have two batteries with the identical specs as far as voltage and capacity but one could be vulnerable to starting fires and the opposite not. But I suspect the particular parts for the handwarmer are going to be fairly fundamental and unsophisticated, and 10% is not a lot of a difference, so likelihood is you would be fantastic. If you do attempt it, possibly do the charging in some place where you gained’t set the home on hearth if the battery begins burning. You’re kind of everywhere with the models, mixing Ah and A, which is the principle point of this weblog publish. However, for your case, most of that is not that relevant, anyway, since you have a much more specific utility, and the main challenge for you is tips on how to charge batteries.
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I recognize having a place the place I can get recommendation like yours. I was attempting to use the present 12-AA battery holder, but you could have suggested a different method, which I will look into. Cheap isn’t the goal, however sturdy and minimal modifications are the targets. If this were my project and I have been trying to do it cheaply/minimally, I would see if a 12V lead-acid battery would give the blinds enough juice. They may run slightly slower, however most likely will probably be ok. Lead-acid batteries are much more forgiving, and a 12V battery could in all probability be topped off by simply connecting two of your eight.4V solar panels in collection and through a diode.
I’m actually going to get a set myself since my Apple Magic Mouse likes to eat batteries for breakfast. With our caravan and touring holidays, we try to verify that there’s a charging station that we can access when on the highway. That means we don’t should depend on batteries packs or rechargeable batteries. I’ve had related experiences with the La Crosse chargers. I’ve had 4 and haven’t found them all the fantastic. And after I bought the charger they threw in a number of of their model of rechargeable batteries.