Do you know a lipo battery that is smaller than 10mmX9mmX3mm??

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Robert Ball

There are li-ion button cells that are close to your dimensions; 10.5mm diameter and 5mm thickness was the smallest I've found (1050 format). Link here:

https://hugebattery.en.made-in-china.com/product/CNgnDvdwybVA/China-3-7V-li-ion-rechargeable-button-battery-for-bluetooth-headset-LIR1050-LIR1248-LIR1448.html

Regards,

Robert