I just chalked it up to being a defective battery that had faulted internally and self-discharged earlier than expected, got another good quality 14250 lithium primary cell and stuck it in, expecting it to work for many, many, many years. Has anyone ever seen a case where one of these PLCs, powered up 24/7, drains the backup battery within a matter of a few months at most? I was surprised originally to find the battery dead several months ago, since the whole unit is only a few years old and typically the batteries last for 10+ years on a system that is constantly powered because the lifetime is essentially the shelf life of the battery and 20 years is not uncommon on these cells. This is on an Allen-Bradley MicroLogix 1400.
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