Thanks very much.

I think I may've already ruined my battery pack. Charging from the pack, my phone sputters with its visual signal, telling me it's charging and then lapsing with a net outcome of zero energy addition. The pack itself will accept recharging. But is it putting out?

The phone, last night, charging from the wall, ended up at 96% (from about 12%). I had to fiddle with the connection to get it to take on to 100% charged. I've never had to do that before.

I'm thinking buy a new battery pack as the first experimental test.