Hardware m3 lite battery, looking for info

migles · Dec 20, 2016

i think my m3 battery needs to be replaced
the battery seems to still hold saves but the rtc stops after a few hours, and if i leave it for a long time, the rtc will get reseted back to 2000 never lost my saves anyway...

from some threads i found people mentioned this is a rechargeable battery, and from my testings it is indeed a rechargeable battery (if i played for a while the rtc would start to work again for a few hours when the console is turned off) and just tested with a multimeter, after a night, the multimeter was reading about 0.30V
after leaving the console on for a couple hours the multimeter read the battery a little above 2 volts...

anyone knows original specs of the battery? like how much it would last from 1 charge, and how much time does it need to get a full charge? i am tempted to leave my console ON for 2 days or something to fully charge this thing and see if it can hold a charge

also, has anyone made a mod which can make the process of swaping the battery easier? i really hate how theese things use solded tabs

and of course i am also looking for the model of the battery and where i can get it in europe... i remember seing that china does no longer ships batteries or something...

how_do_i_do_that · Dec 20, 2016

Someone asked what battery size it used before and I had a picture of the measurements.

The difference in diameter is due to the plastic shrink wrap around the battery.

The battery diameter is 12.5mm, that is the same size as what the 3in1 uses. A CR1220.

The closest thing to the specs on the battery will be here: http://www.digikey.com/product-detail/en/CR-1220/FCN/P279-ND/1874890
It is not the same, but for coin cell batteries they will be nearly identical.

I replaced the battery in my m3 perfect a while back, it wasn't a rechargeable battery.

If your looking into a coin cell holder of some type, it would look something like this: https://www.sparkfun.com/products/10730
Except, nobody seems to carry anything smaller than a 20mm holder, it would have to be a custom low production run of some type. That would be on top of filling away the excess sides on the PCB to make it fit in the footprint of the cart case.
(I would buy such a holder so I can cram them into my flashcarts, so I don't have to buy batteries with tabs)

If you know a shop/vendor or site that deals with Arduino and the like, you might find something.

I believe the transport bans were related to something about exploding batteries. QA being crap in China if your buying from lowest price seller etc.

migles · Dec 22, 2016

how_do_i_do_that said:
I replaced the battery in my m3 perfect a while back, it wasn't a rechargeable battery.

really weird, i measured with a multimeter, after playing a while the battery outputs a lot more voltage than before...
left my console on for an entire day, the battery lasted an entire day and it's still running

from it's behavior i really thought it charges.. if it didn't charge it would just die and and stop working eventually..

thanks for the info!
i will try to take this into a battery shop or something, maybe they can help me with the soldering and ordering a battery..

after this playing around, the card is acting weirdly, it started to randomly crash while playing a game, yesterday it couldn't boot games of 16MB and bigger sizes (loaded the game and just when it was suppose to start it get stuck in a white screen...
however today it happears to be working fine...

albertar · Sep 25, 2017

migles said:
really weird, i measured with a multimeter, after playing a while the battery outputs a lot more voltage than before...
left my console on for an entire day, the battery lasted an entire day and it's still running

from it's behavior i really thought it charges.. if it didn't charge it would just die and and stop working eventually..

thanks for the info!
i will try to take this into a battery shop or something, maybe they can help me with the soldering and ordering a battery..

after this playing around, the card is acting weirdly, it started to randomly crash while playing a game, yesterday it couldn't boot games of 16MB and bigger sizes (loaded the game and just when it was suppose to start it get stuck in a white screen...
however today it happears to be working fine...

Did you ever figure out what type of battery and how to replace it? I can't seem to find any batteries with the same type of soldering tabs that are parallel to each other anywhere

migles · Sep 25, 2017

albertar said:
Did you ever figure out what type of battery and how to replace it? I can't seem to find any batteries with the same type of soldering tabs that are parallel to each other anywhere

i remember you having the the MINI SD versions, at least i don't recall you having the lite version that i do own..
i also own the full SD version (the one that is almost the size of a GBC cart)
they use different types of battery, so the size of my m3 lite battery extremely like it's different than yours m3 sd\mini sd...

anyway, the M3 lite (the one in this thread i talked about) i took it into a store that sells components to repair stuff and they assured me it was a rechargeable battery and said it would cost me 17 euros to replace it and they would apply it themselves... however i didn't ask about the type or size of the battery, because i was happy they would do it themselves i have no experience in soldering, neither materials and i thought, if they ruined it, they would be responsible for it

the battery of the m3 lite seems it lasts a few hours after playing a while, so it kinda holds a charge.. i didn't really bothered to change it yet because i preefer a dead battery and use the boktai trick to change the date\time, than an entire ruined card...

migles · Aug 7, 2018

Update in this subject
i finally changed the battery in this card,
heres info and pic of the original battery
it's 1220 in size.
it's rechargeable
it's Li-ION type
oddly its 3.6 volts
LIR1220 model
had a yellow ring which i removed to read the text more clearly

(click for zoom)

Ryccardo · Aug 7, 2018

migles said:
it's rechargeable
oddly its 3.6 volts
LIR1220 model

The choice of chemicals used inside determines the voltage (and the most common lithium nonrechargeables have indeed a different combination than the most common lithium rechargeables)
"LI" is not a valid chemical in the standard battery naming convention, but at 3,6V it's clearly a li-ion

What's more interesting is that from the photos of the card, there is nothing (at least on that side) that resembles a charger...

migles · Aug 7, 2018

Ryccardo said:
"LI" is not a valid chemical in the standard battery naming convention, but at 3,6V it's clearly a li-ion

correct, its a li-ion battery, it says in the top li ion rechargeable battery, i will upload a picture later today just for the sake of archiving info

ninjalj · Jul 15, 2019

The other side looks like this, for the record.

ninjalj · Jul 15, 2019

Image with the battery not obstructing view of what appears to be static ram.

Hardware m3 lite battery, looking for info

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