Extra battery for extra mileage

[funkykeyboard]

I want to go for a walk in the countryside so wanted to be able to backup my already existing batteries, which will only go about 9 mile anyway, with an extra battery, which will only give me a couple of miles safety leeway. So my questions are this;

1. Can I just plug one battery in providing 12 V to augment the power in the 2 batteries on board, or do I need two batteries wired in (series of parallel?) To provide 24 V plugged in to the side as in the picture below.

2. Will this work? Is it okay just to plug one battery or 2 batteries into the charging connector on the side of my wheelchair, and then this will provide extra backup power?

In order to connect those metal bits to the cable properly I need to solder them. With this gauge of cable and that size of connector, what size soldering iron will I need, solder, flux?



Any advice appreciated, Tremulous Tetra. :-)

[rickystyx]

you would need two batteries in series - better to be looking at the add on lithium pack as putting that much lead on as extra will increase the weight and alter centre of gravity of the chair.
I don't think it is value for money or sensible to try to add lead batteries anyway when a small lifepo4 add on will give you much better results

[funkykeyboard]

you would need two batteries in series - better to be looking at the add on lithium pack as putting that much lead on as extra will increase the weight and alter centre of gravity of the chair.
I don't think it is value for money or sensible to try to add lead batteries anyway when a small lifepo4 add on will give you much better results

thanks. I was in a bit of a rush as I wanted to go for this walk this month. So was just looking for a bit safety margin.

I will be doing lithium on my clone of the BM or my Lifestand wheelchair. Just trying to get a handle on the whole thing.

Anyway I will leave this issue here for now, and start again with the lithium. Thanks for your advice.