I have finally basically completed my Ping Battery mount box in the original position and while it does work I probably wouldn’t do it again and it was not an easy process (BTW lots of the following is a repost from comments made in a previous post).
Heres the box I made for the ping battery. It’s made of plywood (3 or 4 mm) and painted black. It’s quite an odd shape and needed lots of little adjustments with my belt sander to get it to fit Ok.
The standard 15AH 36volt ping is wide and I needed all of the original bottom bracket width to get it to fit. The original greenewheels bottom bracket is ok but it is a primitive affair and if you want a better bottom bracket it could be a problem. The battery also just fits under the seat stays (if that is what they are called) but is is such a tight fit that I have yet to seal the top of the box I built (I’ll use some kind of fabric I think). Lastly all the wiring is messy and i don’t have enough left over room in the box to mount plugs etc and I just have wiring, charger cable etc coming out of the top. Oh yeah I’m also shopping for lower profile tyres because the rear wheel only just (by about 1mm!) clears the new box.
I really wanted to do this so I could keep the back rack free for a child seat but mounting your battery there would be much less hastle. One of those little black topeak bags or something on a rear rack would likely be ideal.
Another option would be the 10 Amp hour version which is much less tall (but still just as wide) or to have Ping Battery make a 15AH battery in a different shape. I have heard of others having batteries built in 2 parts for example. You might be able to get a taller but narrower shape. But keep in mind I needed the room above the battery for a saddle bag which I keep the controller in.
Regarding the ping battery itself it seems really good. I ride from Glebe to Randwick and back not sparing the motor and I never even see the green light go out, so this 15AH battery is likely overkill for me. The “free” charger is not worth the price, it uses some mad coaxial wiring which breaks if you stare at it too hard, spring for the upgraded charger would be my advice.
On the bright side it is all working and mobile and still a pleasure to ride. And an essential backup for my Yuba when it is off the road.