CAT S61 only shows low battery screen upon start

CAT S61 only shows low battery screen upon start I bought a used and defective Cat S61 thinking I could repair it. The problem: When starting the phone it shows the Android/Cat logo and shortly afterwards a battery low screen (low empty battery symbol that is crossed out). When connecting a cable it does the same in a loop (starting, Cat logo, battery low, turning off, starting again, …)
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Guest [Entry]

"Hello @fivefold before you start investing money in either

a) A ***Replacement Battery*** https://www.fixshop.eu/spare-parts-cater...or b) A ***Charging Cable Flex Assembly***

There was a Charging Issue with a Caterpillar S61 a while ago reported by @cambriajean . @Jayeff was kind enough to share some guidance and insights on that case . Maybe they could update how that “FIX” went in the end??

You can review their ifixit.com thread, it is here . Thanks to our community contributors for that!

If you have the necessary tools to think about replacing the battery and if the Cat S61 device is open? (your not using it obviously!)

Consider trying to bypass the Existing Battery, the USB port and the Flex Assembly and probe 3.7V - 3.85Vdc (current limited) directly onto the battery flex connector terminals on the phone engine side from a known good battery or a power supply. NOT directly from a 5Vdc charger or a Power bank 5VdcThat will check if the phone engine boots up. Then you know at least that there is some life in there still and it is worth thinking about investing in the spare parts?I have done this for many devices before, especially with wireless charging devices . I could try to dig out a picture if it makes it clearerBUT - I’m pretty sure the phone engine is ok. This would just serve as a process of narrowing down where the problem is and reducing the risk of buying a component that will be wasted. We also know something is going on for sure on the phone side from your shared picture and that the display worksNot everyone knows how to do such “Hacking” and “Debugging” (Yet!) or has a power supply even ……So, Hazarding a guess, and from the most purchased spare parts for the S-61 that I could see from an on-line shop are this order: the biggest spare parts for the S-61 are 1) Battery 2) Flex assembly & 3) DisplayI’d guess that the volume of batteries that are being inadvertently replaced is due to the flex assembly “wear out”- Which is probably the #1 underlying real cause of the failure as the symptoms would manifest themselves as you have described“The battery will not charge, there is no power (not enough coming) through even though the phone is plugged in”If a repair / spare parts store knows this, they wont advertise it as they get you for the battery first and then you’ll come back for the flex assembly?BUY THE FLEX… do we now open a “fix the flex thread”?

The flex assembly is an electro - mechanical component and it will wear out and fail rather than a battery fading away….."