I have a Milwaukee M18 Fuel 18v LI ion cordless impact wrench. It came with a 18v 2.0 ah 27 Wh battery pack. They also sell a 18v 5.0 ah battery pack among others. When reading online some people say the 5.0 ah battery will provide more power to the tool from the start while others say it will only provide the same power for a longer period of time. I tend to think the latter is true, but I am not an electrical engineer. There was a Youtube video showing that when the guy swapped out the smaller battery for the larger one he was able to break a lug nut loose where the smaller battery was not able to do so. Was that due to other factors like maybe the age of the batteries, or is there something to the larger battery pack providing more power at the motor from the start as well as for a longer duration?
Electronic – Power to tool vs duration of larger ah batteries
batterieslithium ionpower
Related Solutions
117VAC is a sinewave that rises up to a peak of \$\sqrt2\times 117 = 165.5V\$ then back through zero to a negative peak of -165.5V then back through zero and repeats.
How does this allow you to charge a battery of 117V even if you rectified it - you'd still get peaks of about 164V falling to zero then back up to 164V.
Look at the datasheet, if you can't find it, have a look at the place you bought it from, see if they provide any information about the correct way and voltage to drive the Peltier module.
- The easiest way to check if a larger Peltier module will work better than two smaller ones is to check what wattage each small one is rated for and whether the larger one's wattage (50x50mm is usually 60w) is larger than the sum of the two smaller ones.
- If you have not already, add a heatsink, these things get really hot really fast, and you can damage them if you are not careful, if you add a fan to the heatsink, you will get even colder temperatures on the other side.
- I don't know about the size you have, but you need 12v 60w to power a 50x50mm Peltier module, as I mentioned earlier, double check if the voltage and current ratings are corre4ct for your module.
- If I might offer a suggestion, for prototyping, get a bench power supply, that plugs into the wall, if this is too expensive, you can always an old desktop/laptop power supply with a powerful buck-boost converter. This way, you won't have to waste money on batteries.
- It is also worth mentioning that Peltier modules are not very energy efficient, so unfortunately, you probably won't get the kind of cooling that you are hoping for.
Best Answer
A higher capacity battery probably has a lower internal resistance. That means its voltage will drop less than a smaller battery at the same current drain. This effect applies even when both batteries are fully charged.
In addition, the higher capacity battery will last longer at the same current drain.