I'm wondering if AudioMoths will accept rechargeable lithium ion batteries and if anyone has tried using them already? I'm curious how long they last compared to NiMH rechargeable or regular lithium ion batteries. Thanks!
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I use packs of four 18650 batteries. And work very fine, I can record all the night 1 month without problems. In the test I used a 512 Gb Sd and the audiomoth can record 480 Gb of wav files, and it had remaining energy.
No I'm talking about rechargeable lithium-ion, not the NiMH. I've used NiMH before, a couple different brands. But I wanted to try rechargeable lithium-ion because they should in theory last longer.
Great, thanks! Just wanted to make sure they were at least compatible before I tried them. I'm going to have them run continuously at a high sample rate just to see how long they end up lasting.
Ah, I’d forgotten these existed. We’ve never tried them but they should work fine. I can’t find a decent discharge curve plot for them but they claim to maintain close to 1.5V over their capacity. They have some additional voltage regulation inside them which might create some additional noise but worth trying.
Hi Alex, Thanks for the reply! I'm just using 'regular' Audiomoths, and meant rechargeable lithium-ion AA batteries, like putting 3 in to the battery pack (I'm not electronically knowledgeable to figure out attaching external batteries or messing with the board).
Something like these - https://smile.amazon.com/EBL-Battery-Batteries-Capacity-Rechargeable/dp/B08RZ5NDMM/ref=sr_1_6?dchild=1&keywords=rechargeable+lithium+ion+aa+batteries&qid=1634215073&sr=8-6.
Yes, small rechargeable Li-Ion batteries (commonly now LiPo batteries) work really well with AudioMoth. They spend most of their life at a voltage between 4.2 and 3.7V which matches well with AudioMoth’s requirements so you get the full capacity from them. Both the AudioMoth Dev and uMoth boards have JST-PH connectors so you can typically buy a LiPo battery with the correct connector and plug in straight into these boards. There is no standard on the polarity of the connectors and the development board and radio controlled car communities typically use opposite polarities. It’s easy to swap the wires over on the connector though with a small screwdriver to lift up the plastic tab that holds the crimped wire in place. We use these batteries with AudioMoth Dev for short deployments.
https://www.adafruit.com/product/258