Looking for a good quality bike

[Tomtomato]

You said "Battery weight is almost directly proportional to capacity", and that's clearly not the case, at least for certain types of batteries/brands, as demonstrated.

One thing is sure: a 17 Ah Kalkhoff battery does not weight "almost" 55% more than the 11 Ah version.

Looking at generic bottle batteries as well, the weight does not seem to be proportional to the capacity either...

 

[Alan Quay]

How do you explain the difference then? I'd be astounded if the case and BMS weigh 1.5k

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[trex]

batteries are usually arranged in 10S4P (2kg + casing) or 10S5P (2.5kg + casing). Currently, Sanyo 3500mAH cells are the best I can get hold of. You get 36V 17AH in a 3kg 10S5P max.

 

[Tomtomato]

How do you explain the difference then? I'd be astounded if the case and BMS weigh 1.5k

I am not a battery engineer nor a manufacturer of those, so I don't know why the weight is not proportional. I have never pretended to know the answer either.

Back to the original OP's query: my advice would be to get the largest capacity battery, within budget available, as the weight difference may not be that much, and weight on ebikes is less of an issue anyway (they are all very heavy compared to standard bikes).

 

[anotherkiwi]

Different cell types = different capacity for the same number of cells (and different price)

Say the cells have a 5 gram difference in weight = 200 grams more on the battery

 

[Alan Quay]

Different cell types = different capacity for the same number of cells (and different price)

Say the cells have a 5 gram difference in weight = 200 grams more on the battery

So, you think it num 1 above?

It's the most likely explanation.



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[anotherkiwi]

The weight difference shown between the batteries = 100 grams or 2.5 grams per cell.
The Samsung 26F is 44 grams
The 30Q is 48 grams

 

[Alan Quay]

The weight difference shown between the batteries = 100 grams or 2.5 grams per cell.
The Samsung 26F is 44 grams
The 30Q is 48 grams

The weight difference was 450g from the 11.6Ah to the 17Ah

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[anotherkiwi]

I would say they use 50 cells instead of 40 then.

 

[georgehenry]

I take my charger to work in my Ortlieb Panniers that are very useful for carrying other stuff and can be removed, carried about, and re attached very easily. I have a Haibike sDuro and the yamaha battery can be removed very easily and either carried by its carry handle or slipped in a pannier. Removing the battery and display will make your bike less attractive to a thief.

 

[ned65]

A Raleigh Motus has already been mentioned, but I'd still like to say great bike for what you describe you want. Its very well thought out for commuting with a good range.

 

[Ted B.]

Right...

Since I wanted a bike with a long range, I went to the Kalkhoff shop to view a few.

While in the shop, someone was collecting a bike that had a motor fault (not the first time), and another customer was talking about an Integral bike losing power, or something like that. There was surely a lot of bike waiting to be serviced.

Reading this forum a bit more, it sounds like I must stay clear of Impulse 2 bikes!! and that 50 cycles's service is not that great either.

Their integral bikes look good, but they cost too much for me, and not sure about there reliability too!

The Raleigh motus looks nice and is within budget, but battery is just too small I fear...

 

[Ted B.]

Maybe need to look at a Bosch one with a 500 battery, although I am a bit concerned about reliability issues of mid-engine bikes, from what I have read...

 

[ned65]

Right...

Since I wanted a bike with a long range, I went to the Kalkhoff shop to view a few.

While in the shop, someone was collecting a bike that had a motor fault (not the first time), and another customer was talking about an Integral bike losing power, or something like that. There was surely a lot of bike waiting to be serviced.

Reading this forum a bit more, it sounds like I must stay clear of Impulse 2 bikes!! and that 50 cycles's service is not that great either.

Their integral bikes look good, but they cost too much for me, and not sure about there reliability too!

The Raleigh motus looks nice and is within budget, but battery is just too small I fear...

What kind of range are you looking for? Its easy to get over 40 miles and I live in a hilly area. Maybe you could give it a go and if you find you really needed more range get a spare battery

 

[soundwave]

Maybe need to look at a Bosch one with a 500 battery, although I am a bit concerned about reliability issues of mid-engine bikes, from what I have read...

had my bosch bike for 2 years and used a dongle on it the hole time and now around 1500 miles done, tho prob bit more than that as dongle half's everything on the display.

crashed it thrown it down the road sideways and still going all i have broken so far is the xd hub that holds the cassette on and got a new 1 under warranty from crank brothers direct as bought my bike second hand.