Some thoughts on your dilemma:
Stealth Bomber Demon said:
I just took delivery of a Stealth Bomber from Alibaba.
If it's from Alibaba, it's not a Stealth Bomber. Those would come from
https://stealthelectricbikes.com/
in Australia.
What you got is probably one of the bajillions of clones of clones of clones of clones...each of which may be very different from each other and the original, and most of which are not very good bikes mechanically or electrically.
However, I am very suspect that the battery I ordered and paid for is not the battery I received. It was to be a 72 v 70amp battery but looks identical to the 72v 40amp in size. Could they have made a labelling error or not?
An error is possible, but it is more likely deliberate. The less they give you for your money, the more they get to keep.
This kind of scam is not that uncommon; there are battery sellers on all the major sites that do this, wouldn't surprise me if sellers of full bikes are doing this too.
I am assuming by "amp" you actually mean Ah, which is capacity, because A (amp) is a completely different thing (current, or in the case of a battery spec, it's maximum (usually continuous) amps that it can supply before failure/etc, meaning how powerful a system it can supply). .
In addition, I charged the battery today from 47% charge to 100% in under 2 hours with a 10amp charger. It doesn't compute to me.
That doesn't compute here, either--a 70Ah pack at less than half full would need 35Ah+ to fully charge. A 10A charger would need more than three hours to do that (probably four to four and a half).
A 40Ah pack would take more than two hours with a 10A charger to do that. Probably two and a half or more.
My guess is the pack is not even really 40Ah, assuming the 47% SoC is accurate. What is it measured with?
Does anyone have a 40amp or 70amp they are using that they can confirm the measurements or weight for me?
What cells is it made from, and how many S and P are they setup as? Knowing that you can calculate the basic cell weight, and add up to a few pounds for wiring, interconnects, and casing.
The biggest pack I have, for comparison: My EIG NMC 14s2p 52v 40Ah pack weighs between 35-40lbs, no casing, just cells and busbars and cell holders. It's size is something on the order of a handspan by a foot by a foot (I don't have pack dimensions handy, but you can find the specsheet for the EIG C020 cell with dimensions and multiply by 28 cell thicknesses).
At a guess a 70Ah 72v pack could weigh 80-100lbs, depending on what cells it's made from and how their interconnected, secured, and encased.