Why am I not surprised by that, Chris? When other products are rushed to market in an under-developed state,
consumer watch-dogs go into bat, as it were. Who is responding in the case of medical equipment (apart from us right here, that is)?

You're right about control circuitry. It's been decades since I last studied electronics, but I reckon I could still have a stab at designing a battery control circuit! While I'm still reasonably
compos mentis, can someone lay out the actual problem for me, or is it really
rocket science after all?

And yes, you guys are right about erring on the side of caution when replacing batteries on
critical kit (
ie, it's probably best to follow the OEM recommendations). So, let's list which critical bits of kit we're actually talking about (
ie, define "critical", in this context), and then perhaps agree that the rules can be relaxed for "non-critical" applications.