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Old 09-13-2018, 05:12 PM   #1
clearchris
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Default Li-ion AAA replacement with li-ion pack

Ok, I have this device, a skulpt chisel. It's acting funky, and the battery never goes higher than 70% charged anymore. I popped the case open, and instead of NiMH batteries I was expecting (older version had them), I found Li-ion batteries. Two 10440 AAA form factor 3.7v 320mah batteries. I can find 10440 batteries, but finding ones with solder tabs is a challenge. I'm really not into ebay li-ion batteries. I'm not soldering the tabs on myself, it's not worth the risk.

So, I have found a flat pack that will fit. I can cut the plug, solder the wires on, tape the pack down, and it's all good.

https://www.adafruit.com/product/258

My question is, will the electronic protection circuits on this pack interfere with the charging circuits on the board? The standard li-ion AAA batteries don't seem to have any obvious protection circuits on them.

Thanks!

Battery Datasheet:
https://cdn-shop.adafruit.com/produc...ROVED_8.18.pdf

Battery Protection IC
https://www.ablic.com/en/doc/datashe...on/S8261_E.pdf

And there is an 8814 mosfet which i assume cuts off the battery if something bad happens.

skulptboard.jpg
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Old 09-14-2018, 01:46 PM   #2
momaka
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Default Re: Li-ion AAA replacement with li-ion pack

If these two current Li-ion AAA batteries are in parallel there without any protection... oh boy!

I don't imagine the Li-ion pack with protection will have issues with the charging circuit, but I'm not an expert in this area. Will wait for someone else with more experience to chime in here.
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Old 09-14-2018, 02:46 PM   #3
clearchris
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Default Re: Li-ion AAA replacement with li-ion pack

They do appear to be in parallel, but from my readings on li-ion charging it's not neccessarily a problem. You have to build a "balance" phase into the charging. At any rate, I think I'm going to a single cell pack, so it should be safer in that regard.
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Old 09-15-2018, 05:33 PM   #4
sam_sam_sam
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Default Re: Li-ion AAA replacement with li-ion pack

Quote:
Originally Posted by clearchris View Post
So, I have found a flat pack that will fit. I can cut the plug, solder the wires on, tape the pack down, and it's all good.

https://www.adafruit.com/product/258

My question is, will the electronic protection circuits on this pack interfere with the charging circuits on the board? The standard li-ion AAA batteries don't seem to have any obvious protection circuits on them.

Thanks

Attachment 182610
You should be fine with this battery but do not remove the protection board
Unless the unit requires a different cut off voltage to the batteries then that could be a problem I have only seen this a couple of times
Your unit should work fine with it
__________________
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Last edited by sam_sam_sam; 09-15-2018 at 05:38 PM..
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Old 09-15-2018, 06:33 PM   #5
petehall347
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Default Re: Li-ion AAA replacement with li-ion pack

recycle the charge fully 3 times and see what happens.
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Old 09-16-2018, 02:02 PM   #6
clearchris
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Default Re: Li-ion AAA replacement with li-ion pack

So far, so good. It's reading 94% charged, which is better than the 70% charged the old batteries would show. I don't know that it will ever be fully cycled, it gets used for a few minutes and put back on the charger. I could leave it off the charger for a few weeks, if you guys think that it would be helpful to fully cycle it.

I put double sided tape on the top to stick it to the top case and same tape on the bottom to protect the battery in case it gets loose. There was a lot of room left, I could have easily used a larger battery.

Overall, this was a pretty easy fix. The case came apart with a plastic pry tool, there was no breakage, the clips seemed stout. I cut the batteries off with some side cutters so I could use as much heat as needed to remove the tabs from the board.

We'll see how this battery holds up.

Thanks to everyone!

skulpt-fixed.jpg
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Old 09-17-2018, 02:33 AM   #7
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Default Re: Li-ion AAA replacement with li-ion pack

Good to hear it's working. As a bonus, you also have a slightly upgraded capacity from before as well (1x 850 mA battery vs. the old 2x 320 mA, which didn't even charge fully).
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Old Yesterday, 07:18 PM   #8
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Default Re: Li-ion AAA replacement with li-ion pack

What is your voltage when it says 94 % this might be a problem with having two protection board on the unit if your voltage to the battery is 4.2-something you’ll be alright you just have to remember that when it says 94% mean that it fully changed

Last edited by sam_sam_sam; Yesterday at 07:19 PM..
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