Need advice with changing aaa batteries to li-on on my mouse

[Itsmadxme]

Im getting sick of use of aaa batteries on my mouse (Xiaomi – Mi Dual Mode Wireless Mouse Silent Edition)

 

I found a mod for on YouTube for logitech g304 that kinda solves the problem in correct way without any damage for ciruit and its work(there were comment was somehow talked about this (1pic attached)) and with proper components (i think

 

 

But issue i get here is that logi's mouse required aa battery with total 1.5v, and my mice is using 2 aaa batteries with total 3v in use. So there i have questions:

1) Is it ok to built mod my self as same as it goes in video to my mouse? 

2) if its not, what i need to change in the scheme( mby resistor with different ohm, or some dc convertor)

 

I don't have much knowledge in electronics so i didnt understand how to proper get right components', but I'm able to build/make things as it sayd by whomd

 

And i think this topic is in wrong thread, so if it is where i need to copy this topic?

 

Many thanks!

[Poinkachu]

12 minutes ago, Itsmadxme said:

Im getting sick of use of aaa batteries on my mouse (Xiaomi – Mi Dual Mode Wireless Mouse Silent Edition)

 

I found a mod for on YouTube for logitech g304 that kinda solves the problem in correct way without any damage for ciruit and its work(there were comment was somehow talked about this (1pic attached)) and with proper components (i think

 

 

But issue i get here is that logi's mouse required aa battery with total 1.5v, and my mice is using 2 aa batteries with total 3v in use. So there i have questions:

1) Is it ok to built mod my self as same as it goes in video to my mouse? 

2) if its not, what i need to change in the scheme( mby resistor with different ohm, or some dc convertor)

 

I don't have much knowledge in electronics so i didnt understand how to proper get right components', but I'm able to build/make things as it sayd by whomd

 

And i think this topic is in wrong thread, so if it is where i need to copy this topic?

 

Many thanks!

Just buy a rechargable AA batteries ?

 

Or if you want the mouse to be lighter in weight, buy a rechargable AAA battery & an AAA to AA battery adapter. Like what I did.

 

Example :

Normal Type :

https://www.amazon.com/Duracell-Battery-Charger-Batteries-batteries/dp/B000FGGG34/ref=sr_1_30?crid=15YK6HWXUSPD3&keywords=rechargeable+aa+battery&qid=1680368653&sprefix=rechargable+aa+battery%2Caps%2C305&sr=8-30

 

Type that charge battery directly using micro-usb / type-c cable :

https://www.amazon.com/TEMIBATT-1-5V-Rechargeable-Batteries-Charging/dp/B08SKBJVNG/ref=sr_1_36?crid=1SVO3P7BPZZOZ&keywords=rechargeable+aa+battery+micro+usb&qid=1680368714&sprefix=rechargable+aa+battery+micro+usb%2Caps%2C309&sr=8-36

 

AAA to AA adapter :

https://www.amazon.com/LAMPVPATH-Battery-Adapter-Converter-adapter/dp/B07D6RDQ3S/ref=sr_1_3?crid=28IEQQ0EW9FAH&keywords=AAA+to+AA&qid=1680368786&sprefix=aaa+to+a%2Caps%2C309&sr=8-3

 

 

[Murasaki]

I've been using wireless mice for years (I have two G305). Just use rechargable batteries, get twice the amount you use and cycle between them. I find 2 AA batteries to be overkill but hope that translates to good battery life.

[svmlegacy]

16 minutes ago, Itsmadxme said:

and my mice is using 2 aa batteries with total 3v in use

Check if this is true before doing anything. Many wireless mice use two batteries in parrellel, to provide 1.5 V at a higher capacity.

 

You'll definitely want to do some reading on electronics before attempting this.

 

Agreed with others that the real answer here is rechargeable AA cells.

[BlueChinchillaEatingDorito]

The battery life for wireless mice is months so wireless charging is really just a gimmick rather than an actual quality of life improvement. 

[Poinkachu]

6 minutes ago, BlueChinchillaEatingDorito said:

The battery life for wireless mice is months so wireless charging is really just a gimmick rather than an actually quality of life improvement. 

I have to add :

And rather annoying when you need to bring the mouse to somewhere else that doesn't have wireless charging pad embedded too <_<

[SorryBella]

9 minutes ago, BlueChinchillaEatingDorito said:

The battery life for wireless mice is months so wireless charging is really just a gimmick rather than an actually quality of life improvement. 

And those are for high poll rate optical mouse like Orochi and G305, ive seen lots of logitech m wireless mice never have its battery replaced ever. Unless if OP consistently uses it 24/7 or Xiaomi has a bad sleep algorithm (highly unlikely, its usually the expensive MCU that skimps on sleep schedule for its wireless protocol), i think this is more of a pet peeve than legitimate problem.

[mariushm]

A fully charged lithium battery will have a voltage up to around 4.2v - As it discharges, the voltage will drop relatively fast to around 3.6...3.7v where it's gonna be for most of it's charge, and then the voltage will go down towards 3v.

 

Your mouse most likely uses 2 batteries in series, as a way to get a higher voltage. With rechargeable alkaline batteries, each battery is 1.2v ... 1.35v, and a full discharged battery will have around 1v .. 1.1v 

Non rechargeable alkaline batteries will have a voltage of up to 1.65v when fully charged, but the voltage drops quite fast (within minutes of use) to around 1.5v and then as the battery discharges, voltage will go down towards 1v threshold.

 

So if your mouse uses 2 batteries in series, you can probably safely assume that it was designed to work with 2.4v ... 3.3v range.

You could use a switching regulator IC to convert your battery voltage down to this range, but at the low power amount a mouse consumes such regulators won't be much more efficient than a basic linear regulator.

A linear regulator throws out the difference between input voltage and output voltage as heat, while a dc-dc converter is more efficient but uses some power to do the conversion.

 

So for example, a linear regulator converts 4.2v to 3v with an efficiency of 71%  (3v / 4.2v) so if mouse consumes 10mA  the solution would consume 4.2v x 0.01 = 42mW

A dc-dc converter circuit may convert 4.2v to 3v with an efficiency of 90% but consume 3mA to do that, so the total power would be  (3v x 0.01) * 100/90 + 4.2x0.003 = 0.046  or 46 mW

 

SO yeah, get a linear regulator to reduce output of the battery to safe levels. You can get fixed output voltage regulators that output 2.5v or 3v and only need a ceramic capacitor on the output.

Some examples : https://www.digikey.com/en/products/detail/torex-semiconductor-ltd/XC6210B302MR-G/2138118

Vin and CE are connected to battery voltage, Vss is ground (connected to both battery negative and mouse negative input)  Vout goes to mouse positive voltage

 

another example :  https://www.digikey.com/en/products/detail/diodes-incorporated/AP2138N-3-0TRG1/4770631

has just 3 pins, Vin , ground ,Vout ... same deal, a ceramic capacitor at input and output that's all it needs.

 

For lithium battery use whatever you want that fits the area ... a AAA battery is around 45mm tall, around 10mm in diameter, so you'd be looking at around 40mm tall x 20mm wide x 10mm thick battery max. 

A AAA battery has around 800-1000mAh of charge ... you can get lithium batteries in such dimensions up to maybe 1.2-1.5 Ah so not much more energy

 

Here's some batteries that would fit inside 2AAA compartment :  https://www.digikey.com/short/tz85njtz

 

I would suggest just getting two such batteries, and flip between them, when one is discharged, put the other one in a charger ... you can make a cheap charger with a 1-2$ charger from eBay

 

For example : https://www.ebay.com/itm/394433185945

Would fully charge one of those batteries in an hour or so.