Hi All,
This is my first post at AAC; it looks like a great place to come for advice about battery selection for my project. I'm trying to refurbish some wildlife radio transmitters. The manufacturer wants $165 to refurbish each one, when all they need is a new battery. I've not been able to determine the original battery type, as they are completely unmarked; see attached photo. The originals are of unknown age and the xmitter that still has a charge and functions has a measured voltage of ~3.4V. The batteries are basically hooked up in parallel, with each positive terminal wired separately to the chip. Hooking one of these positive terminals to a spare 3.7V 1200mA flat-style lipo battery from adafruit seems to work perfectly.
My questions are:
1. Does anyone recognize this battery type? I'd prefer to replace with the original type if it can be found. Dimensions of each are ~1 1/8inch long by 1/2 inch diameter. The terminals are solderable. They are completely unmarked.
2. If i can't replace with the original battery type, my next best option would be to select an alternative 3.7V battery. Keeping the profile and weight roughly equivalent to the original is important, as these will be encased in hard epoxy and attached to tortoises. The transmitters are very low drain, and can last for 1-2 years on the original batteries. The flat lipo batteries are attractive given how flat they are. If encased in hard epoxy and then attached with putty epoxy, do these seem like a good option for deployment for 1-2 years at a time? The (encased) batteries will be exposed to the Florida summer sun when the animals bask, and experience long periods at ~40 degrees F in the winter. Are there there reliability or safety concerns that could be mitigated by selecting an alternative type of battery? I've found somewhat conflicting information online about lipo vs lithium ion vs other types of lithium batteries.
Many thanks for any and all thoughts on this!
This is my first post at AAC; it looks like a great place to come for advice about battery selection for my project. I'm trying to refurbish some wildlife radio transmitters. The manufacturer wants $165 to refurbish each one, when all they need is a new battery. I've not been able to determine the original battery type, as they are completely unmarked; see attached photo. The originals are of unknown age and the xmitter that still has a charge and functions has a measured voltage of ~3.4V. The batteries are basically hooked up in parallel, with each positive terminal wired separately to the chip. Hooking one of these positive terminals to a spare 3.7V 1200mA flat-style lipo battery from adafruit seems to work perfectly.
My questions are:
1. Does anyone recognize this battery type? I'd prefer to replace with the original type if it can be found. Dimensions of each are ~1 1/8inch long by 1/2 inch diameter. The terminals are solderable. They are completely unmarked.
2. If i can't replace with the original battery type, my next best option would be to select an alternative 3.7V battery. Keeping the profile and weight roughly equivalent to the original is important, as these will be encased in hard epoxy and attached to tortoises. The transmitters are very low drain, and can last for 1-2 years on the original batteries. The flat lipo batteries are attractive given how flat they are. If encased in hard epoxy and then attached with putty epoxy, do these seem like a good option for deployment for 1-2 years at a time? The (encased) batteries will be exposed to the Florida summer sun when the animals bask, and experience long periods at ~40 degrees F in the winter. Are there there reliability or safety concerns that could be mitigated by selecting an alternative type of battery? I've found somewhat conflicting information online about lipo vs lithium ion vs other types of lithium batteries.
Many thanks for any and all thoughts on this!
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