Thanks all! You guys are brilliant – as helpful as I remembered from years ago when I had a battery question. :)

I see that the Bongo Shop page lists "Diesel Pump Seals (set of 2)", so it's a reasonably logical bet that the second seal is the same as the first. The place where I got the first seal ...

My dear old Bongo has a leaky fuel pump. My local garage isn't a Bongo specialist but they are always really helpful, and they've changed the O ring seal at the accessible end of the pump – but it turns out the other end needs replacing as well. In order to save time & money (at their suggestion) I ...

Go for a proper split charge system.

I would also suggest that you read through the recent battery info post regarding safety warnings.

Good points, both of them. I have read that (long) document about batteries and safety (among lots of other stuff, and I'm thinking perhaps I'll just disconnect ...

Wow. Thanks for all this info! I'll see if I can fit an isolator switch before Wednesday to make disconnection of the second battery easy to do in a field. (And good point: I must remember to switch it on again when I'm done camping.)

Longer term, I will read, re-read and digest the excellent ...

I just put an isolator switch in the cable joining the two positive terminals.
Interesting idea. I could certainly do this (with a bit of help from a friend perhaps). Would this effectively keep it in reserve, so if I ran one down I could slap myself on the wrist but be able to switch it in and ...

Yes, there is a thick lead running from the passenger-side battery to the driver-side one, and yes they're the same size. And I do indeed have that button with the snake-lined engine graphic. (I've never switched it on before though; it lights up when I do.)
I've learned something new (again!); my ...

Heh. Great suggestion, makes sense to me! So whatever I run will only be draining the other battery, leaving the standard one untouched and ready to come to the rescue if things go that way. :-)

Now, am I right in assuming that the main battery is the one on the left as I peer into the engine ...

Thanks - I appreciate that that's what I should do in the end. But what I need to know is Bongo-specific stuff; if I did do as you suggest I suspect I'd still be in the dark regarding the leisure battery, its use, and how to avoid going flat!

Lets say I got a multimeter and worked out how to use it ...

Hi all - I'm a newbie... well, sort of: I've had a Bongo for a year but not posted here before and I'm not experienced at car mechanics. My Bongo has two batteries under the bonnet, and I was told one is the leisure battery. Don't know which one though!

I recently used my Bongo at a festival. (Yes ...