Hello everyone , i am new here and i am just learning electronics , but i have a question that might be somewhat strange , but first i apologize if this post does not belong here as i am new.

the question is as follows and also check the included picture:

-i have a device that gets power from a x2 AA battery (the windows mixed reality controllers).
-the device consume a lot of energy as it have a lot of sensors.
-so i have 2 ideas but i don't know what would be possible if any.
a-check the included picture, i want to make the batteries to be chargeable while they are inside the controllers (will this harm the controller?)
b-make the controller use a Li-po batteries with voltage divider to make it 3v and include a Li-po USB charger board (i don't know which one is best).
-the controllers can only draw power from the batteries and can't charge them(to charge them you must take them out and use an external charger).

so with (a) will it harm the controllers?
and with (b) is it even possible?

thanks in advance for any help i get

note: controllers Info

 

Welcome to AAC!

How are the two batteries connected? Series or parallel?

Wouldn't making the controllers wired negate the benefit of being battery operated?

 

Welcome to AAC!

How are the two batteries connected? Series or parallel?

Wouldn't making the controllers wired negate the benefit of being battery operated?

Okay i must apologize becuase i forgot a small info.

First i think the batteries are parallel Becuase the + are next to each other (is there way to measure it?).

About (a) the connection will be only made between the contoller and charger when i put the controllers in their holder (i am gonna make them) (look at the yallow boxes these are gonna be copper contacts between the controllers and the charger).

 

First i think the batteries are parallel Becuase the + are next to each other (is there way to measure it?).

That's not a valid assumption. Series is more likely. The easiest way to check would be to look at the battery compartment.

 

That's not a valid assumption. Series is more likely. The easiest way to check would be to look at the battery compartment.

Yes its written in the battery compartment , both + is at the edge of the controller while the - is on the other side, infact i always plug them like that and it works just fine.

 

That's not a valid assumption. Series is more likely. The easiest way to check would be to look at the battery compartment.

Also what i wanted to know is will plugging the charger like the image will harm the controllers?

 

Also what i wanted to know is will plugging the charger like the image will harm the controllers?

Difficult to say without seeing a schematic for the controllers.

If the batteries are in parallel as you say, you should only make one connection to the charger. Most chargers will accommodate multiple capacities, so two batteries in parallel would look like a single higher capacity battery.

Using and charging batteries in parallel is a compromise. The weaker battery will decrease runtime and it will spend more time in overcharge than the stronger one when being charged. In a worst case scenario, the weak battery could fail shorted and cause other problems; like a fire.

Instructions for battery operated devices usually include a caution to not mix and match battery chemistries and to change the batteries together (don't mix fresh with used).

 

The charger unit would have to have each battery on an isolated circuit for that connection scheme to work.
That's unlikely: they are probably all in parallel.

 

Difficult to say without seeing a schematic for the controllers.

If the batteries are in parallel as you say, you should only make one connection to the charger. Most chargers will accommodate multiple capacities, so two batteries in parallel would look like a single higher capacity battery.

Using and charging batteries in parallel is a compromise. The weaker battery will decrease runtime and it will spend more time in overcharge than the stronger one when being charged. In a worst case scenario, the weak battery could fail shorted and cause other problems; like a fire.

Instructions for battery operated devices usually include a caution to not mix and match battery chemistries and to change the batteries together (don't mix fresh with used).

First thanks for taking time to replay , but as i understand both ideas won't work and might cause harm to the device?.

but as side note i am not gonna charge them and use them at the same time , when draining the battery it will be disconnected from the charger , and when i want to charge them the device will be switched off.

 

The charger unit would have to have each battery on an isolated circuit for that connection scheme to work.
That's unlikely: they are probably all in parallel.

I have that exact charger and it can charge only 2 or 4 no less no more , so still would it harm the controller?.

All i care about is not providing an extra voltage to the controller and damage it , so if there is no sure way to do it i would ignore for sure.

 

Does the controller have an on/off slide-type switch?

To determine whether the batteries are in series or parallel, measure the voltage across all terminals between the two batteries. If they are in series, one measurement will give 3V.

The easiest would be to buy two sets of rechargeable batteries for each controller and just swap them between the charger and the controller when the batteries go dead in the controller.

 

Does the controller have an on/off slide-type switch?

To determine whether the batteries are in series or parallel, measure the voltage across all terminals between the two batteries. If they are in series, one measurement will give 3V.

The easiest would be to buy two sets of rechargeable batteries for each controller and just swap them between the charger and the controller when the batteries go dead in the controller.

Not a slide switch , just a button you click and hold for 3 secs to power on and 5 secs or more to switch off.

For the measurement i sure will do it and as soon as i have results i will report back.

For buying another set of batteries sadly this is the reason for my questions , they eat a lot of energy and sometimes they get too sensitive for a little low voltage and turn off.

But anyway really thanks for all the replays , it sure helped me.

 

Not a slide switch , just a button you click and hold for 3 secs to power on and 5 secs or more to switch off.

If this actually disconnects the batteries, it could work.

 

Does the controller have an on/off slide-type switch?

To determine whether the batteries are in series or parallel, measure the voltage across all terminals between the two batteries. If they are in series, one measurement will give 3V.

The easiest would be to buy two sets of rechargeable batteries for each controller and just swap them between the charger and the controller when the batteries go dead in the controller.

Also the reason behind my post is that i am planning in making a wall holder for the controllers and i want to just put them on the holder and they start charging automatically , sadly i am not good in the electronics part.

 

I would assume that the batteries are in series when operating the device but in parallel when being charged.