Modifying a Micro-Heater for Rechargeable Cell Phone Battery Use

In summary, the conversation discusses using rechargeable batteries for a small micro-heater that runs on a single AA battery. The speaker wants to modify the heater to use a rechargeable cell phone battery, but has questions about the safety and effectiveness of doing so. They also explore using a hand warmer as an alternative option. The conversation highlights the importance of using batteries that are rated for the specific device and not altering voltage levels.
  • #1
Hi! My brother has a small micro-heater that runs on a single AA battery. The battery life tends to be rather short so we started using rechargeable batteries. The rechargeable batteries are marked as 2000mAh and since they're AA and Nickel-metal Hydride I'm guessing they operate at 1.25v.

I want to mod it for use with a rechargeable cell phone battery. But I have a few questions about that.

1. The cell phone battery is marked as 3.7v, 930mAh, 3.4Wh and is a Li-ion battery. Is it safe to use a Li-ion battery? The NiMH batteries tend to heat up, will this damage the cell phone battery?

2. Assuming P=IV and V=IR hold true here, would I just have to add a resistor to decrease the current and send the same power to the heater? Is it really that easy?

3. Would there be any difference in sending a higher voltage and lower current to the heater if it receives the same power?

4. Given the cell phone battery is running with a higher resistance, would it last longer than two AA batteries? If its not, then this project isn't worth it.
 
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  • #2


88 views and no replies? :frown: Does anyone have any speculation on the answers?
 
  • #3


kylethedab said:
88 views and no replies? :frown: Does anyone have any speculation on the answers?
What type of heater is it. I mean, what does it heat.

The short answer is no, it's probably is not a good idea to try and run that from anything too different from it's rated voltage, certainly not a phone battery. Post more details about the nature of the heater, especially it's voltage and current and/or power ratings.
 
  • #4


Lithium batteries are brilliant but only when run as they are designed to. Steer clear unless you know what any particular battery is rated at and can present it with the right load.
BTW, you can't operate a simple heater with 'higher volts and lower current' because its resistance is what it is. More volts will give you more current (I=V/R)
Primary cells are actually pretty high capacity so they tend to last well - they just cost a bit to replace.
 
  • #5


Your cell phone battery only has 3.4Wh. A 2000mAh AA NiMH battery has about 2.4 Wh. So why not use 2 NiMH batteries?
What do you want to use that heater for? You could also use a hand warmer.
http://en.wikipedia.org/wiki/Hand_warmer
A sodium acetate hand warmer weights usually 200g and releases 14 Wh of heat. More than 5 times the energy of a AA battery. A hand warmer powered by lighter fluid gives you even a lot more energy. Just a drop of lighter fluid releases more heat than a battery. (10Wh per ml)
 
  • #6


You don't want his small brother setting fire to his pocket, do you? HAHA
 

1. How does modifying a micro-heater affect the performance of a rechargeable cell phone battery?

Modifying a micro-heater for rechargeable cell phone battery use can greatly improve the performance of the battery. The heat generated by the micro-heater can help to optimize the battery's charging and discharging processes, resulting in a longer lifespan and better overall performance.

2. What materials are needed to modify a micro-heater for rechargeable cell phone battery use?

To modify a micro-heater for rechargeable cell phone battery use, you will need a micro-heater, a rechargeable cell phone battery, a temperature sensor, and appropriate wiring and connectors. It is also recommended to have a soldering iron and basic electrical tools on hand.

3. Can any micro-heater be used for this modification, or are there specific requirements?

Not all micro-heaters are suitable for modifying for rechargeable cell phone battery use. It is important to choose a micro-heater with the appropriate voltage and power output for your specific battery. Additionally, the micro-heater should be able to reach a high enough temperature to effectively optimize the battery's performance.

4. Is modifying a micro-heater for rechargeable cell phone battery use safe?

When done correctly, modifying a micro-heater for rechargeable cell phone battery use is safe. However, it is important to follow proper safety precautions, such as wearing protective gear and working in a well-ventilated area. It is also recommended to have some knowledge and experience with electrical work before attempting this modification.

5. Are there any potential drawbacks to modifying a micro-heater for rechargeable cell phone battery use?

One potential drawback of modifying a micro-heater for rechargeable cell phone battery use is that it may void the warranty on your battery. Additionally, if the modification is not done correctly, it could potentially damage your battery and/or phone. It is important to carefully research and follow proper instructions when attempting this modification.

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