Looking for a good quality bike

Tomtomato

Esteemed Pedelecer
Apr 28, 2015
388
196
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

Esteemed Pedelecer
Dec 4, 2012
2,351
1,076
Devon
How do you explain the difference then? I'd be astounded if the case and BMS weigh 1.5k

Sent from my HTC One_M8 using Tapatalk
 

trex

Esteemed Pedelecer
May 15, 2011
7,703
2,671
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

Esteemed Pedelecer
Apr 28, 2015
388
196
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

Esteemed Pedelecer
Jan 26, 2015
7,845
5,786
The European Union
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
 
Last edited:

Alan Quay

Esteemed Pedelecer
Dec 4, 2012
2,351
1,076
Devon
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.



Sent from my HTC One_M8 using Tapatalk
 

anotherkiwi

Esteemed Pedelecer
Jan 26, 2015
7,845
5,786
The European Union
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
 

anotherkiwi

Esteemed Pedelecer
Jan 26, 2015
7,845
5,786
The European Union
I would say they use 50 cells instead of 40 then.
 

georgehenry

Esteemed Pedelecer
Nov 7, 2015
1,446
1,264
Surrey
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

Finding my (electric) wheels
May 26, 2016
11
5
59
wales
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.
 
  • Like
Reactions: Ted B.

Ted B.

Pedelecer
May 28, 2016
54
42
44
Guildford
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.

Pedelecer
May 28, 2016
54
42
44
Guildford
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

Finding my (electric) wheels
May 26, 2016
11
5
59
wales
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

Esteemed Pedelecer
May 23, 2015
16,774
6,451
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.