[Expo-tech] Cave Link Surface charging

[Wookey]

On 2019-07-08 17:21 +0200, Andrew Atkinson wrote:
> The surface box has a 5 pin plug with only 4 pins. 
> In the box there are:-
> 
> 2 of the 4 pin  plugs that fit into the cave link, one of which is connected.
> Nothing distinguishes these two leads.

Right. I noticed that - I've not yet understood what the 2nd one is
for.
 
> 2 batteries only one of which connected, there are connectors to connect 3
> batteries.
> 
> Questions
> 
> Can I connect the second battery?

Only if all at the same/similiar charge state otherwise you might melt
wires if one is totally flat and one is full. They are just paralleled
(AIUI). We need to be careful about this. I think the idea is that all
3 (there is one inside the cavelink) are plugged in in parallel. But
you _could_ choose to run 2 until flat, then swap to the 3rd one
(internally fitted) so you had a spare. This makes more sense for the
underground stn (havng a spare batt). I think we should probably just
leave all 3 plugged in together and use 3 in parallel, then people
can't fuck it up. I'd balance them by charging all to same state with
accucell6 (no balance connector - boo), then charge the 3 as a set.
 
> I have assumed the 4 pin plugs do not need to be swapped to change from GSM to
> charging. Please tell me if this is wrong!

I assume so too, but I have not yet grokked the pinouts for charging
on the various connectors.

Wookey
-- 
Principal hats:  Linaro, Debian, Wookware, ARM
http://wookware.org/
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