On Sat, 8 May 2021 13:04:35 +0000 (UTC), RJH
wrote:

snip

FYI, the jump leads connect direct to the battery, nothing inline.

Ideal then (for you proposed solution).

Two smaller
wires feed direct to the other gubbins from the battery.

So charge indicators (if there are any), the USB board or even the
socket for the supplied charger etc.

I suppose my concern
is that the charger might push something unpleasant along those smaller wires.

Unlikely unless the battery is open circuit and a smart charger has a
de-sulphation phase that might try to pulse the battery with higher
volts etc. Otherwise, *any* charging of that battery is going to 'push
whatever along those wires. ;-)

But quite what, if anything, is way beyond my pay grade . . .

(As an aside ...) It still sounds wrong when people say that, although
I understand it *also* covers knowledge about something, rather than
the level of authority / responsibility over others. ;-)

https://www.macmillandictionary.com/...ve-my-paygrade

Cheers, T i m