On 7 May 2021 at 23:33:19 BST, "T i m" wrote:

On Fri, 7 May 2021 21:26:16 +0000 (UTC), RJH
wrote:

Would it be OK to charge on of these:



https://www.walteronline.com/en/tool...mpressor-p3155

(jump starter/compressor/light/USB) by connecting the jump leads to a car
battery charger, rather than use the supplied AC adapter?

I'd say 'yes', assuming it contains a 12V LA battery (it looks like it
does) and the chare rate is kept low, (say around C/20 of 17.2Ah =
~1A).

What is the current output of the supplied charger OOI? As long as you
are less-than or equal to that you should be fine.

As it's a maintenance-free (likely 'sealed') battery, I wouldn't
charge it any higher than 5A or if you did, for too long (and keep an
eye on the battery temperature (with your fingers) if you can get to
it easily). Any sign of any real warmth, stop.

The only reservation re charging back though the output leads might be
what constitutes the 'overload protection', but nothing any output
indicator on the charger or your voltmeter wouldn't determine.

That's the sort of job an Optimate 2 was designed for (as it can be
left on indefinitely). ;-)


Thanks - it is a LA sealed battery, and I've got one of those Lidl
'intelligent' chargers, which I'd guess is quite gentle.



--
Cheers, Rob