How to change correct battery in any TWS Airbuds Case?

Question

I have been using Truke Buds BTG3 (having 3.7 V 300 mAh battery in case) more than a year. Battery backup of the charging case got poor because of weak battery! So I am trying to replace it with a new one.

What my confusion is that how can I find the maximum battery capacity that can be added for the embedded PCB?

And can I use a larger capacity 3.7 V Lipo battery like 450 mAh or 950 mAh single cell batteries with varying WH safely. Since the built-in battery has 300 mAh with 1.11 Wh, does this make a sense in upgrading battery?

And overall are there any challenges and risks in replacing battery which may leads to failure?

Does this answer your question? Choosing power supply, how to get the voltage and current ratings? — JYelton, Dec 12 '23 at 16:43
Probably fine with higher capacity. However, be very careful with that spicy pillow. Accidentally poke it with your soldering iron and it may burst in flames and molten particles spewing out. — winny, Dec 12 '23 at 16:45
The problem most likely to ruin your improvement is that the charge controller may be programmed to count charge in and out of the battery and may shut off when it thinks "that's enough by now". — Transistor, Dec 12 '23 at 16:53
Do you think that the charge controller is programmed to a level by this newborn tws company?? But I wonder after the case gets charged, the charging light indication will be constant rather than blinking while in charge! — Arun Jothi, Dec 12 '23 at 17:48

score 1 · Accepted Answer · answered Dec 12 '23 at 16:53

1

Yes, you can use a larger-capacity Li-ion battery. Just make sure it's the same voltage (3.6 or 3.7 V nominal) and that it includes a protector BMS (the little board you see at the end of the Li-ion cell).

In terms of risks:

Be absolutely sure you don't short out the battery leads
Be absolutely sure you connect the red wire to the positive pad, the black wire to the negative pad
Enclose the Li-ion pouch cell in the enclosure in such way to contain its expansion (if any)

answered Dec 12 '23 at 16:53

Davide Andrea

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Thanks for your response And there is one more clarification in the first point that you warned about shorting the battery leads. I can't understand it could you specify clearly as I am a newbie in this thing – Arun Jothi Dec 12 '23 at 17:44
"And I wonder can we connect multiple batteries without any harm?" That's a different question. Please start a new question. – Davide Andrea Dec 12 '23 at 19:58

How to change correct battery in any TWS Airbuds Case?

1 Answers1