Battery position

[Eaglerider]

Perhaps the less discussed topic of rapid charging could help all shapes of battery. I did see a charger advertised a while back that claimed a full 10a/h recharge in about an hour. At the time it was muted this might dramatically reduce battery life expectancy, but perhaps if it was only used occasionally whilst out on long trips and at all other times use the normal slow charge system.

It would be great to stop for an hours lunch and get a 10a/h recharge.

 

[NRG]

My preference is for rack mounting but as Dave said earlier most standard fitted ones are too far back and high, I managed to move the one on my Alien down and forward and it looks much better and neatly hidden by a small pannier set. Next preference would be for the behind seat post mounting position and then un frame mounting. I don't like the water bottle batteries they don't fool anybody or look particularly nice.

 

[Kudoscycles]

Its so interesting everyones idea of the ideal position of the battery-if you read back the first 5 postings each one has selected a different location. Its this variety of choice that makes these ebikes such an interesting engineering challenge but also the reason why there is no uniformity and that is why no volumes of scale can produce cheap batteries.
We have used the same water bottle style of battery on all our new performance range and that same battery is used by many of my competitors so at least that size/shape should have some volume and ready replacement availability,it is cheap at £198.00 so volume does have an affect.
Thanks for all your inputs but it seems very personal as to the best solution.
Dave
Kudoscycles

 

[Kudoscycles]

What is the life span of these bottle battery's, 1-2 years or longer.? and the cost please.

Thanks

Zebb,the LiMn04 battery also Lithium Ion,Lithium Polymer have about a life of 2-3 years,the LifePo4 batteries could have a life of 5 years plus....but LifePo4 has a lower energy density(is heavier and bulkier)so its difficult to mount in the water bottle position. I did approach a battery supplier at the Shanghai cycle show and we calculated that in the same size bottle it would only be possible to sqeeze 6 Ah of LifePo4 cells against 10Ah LiMn04,6Ah is too small range-for that reason LifePo4 batteries tend to be rack mounted or mounted behind the seat tube.
Dave
Kudoscycles

 

[Deleted member 4366]

I did approach a battery supplier at the Shanghai cycle show and we calculated that in the same size bottle it would only be possible to sqeeze 6 Ah of LifePo4 cells against 10Ah LiMn04,6Ah is too small range

It's not just the range. You can't get enough power out of a LiFePO4 battery that small unless you use A123 cells or Headway cells, both of which are relatively heavy and expensive.

 

[Zebb]

Zebb,the LiMn04 battery also Lithium Ion,Lithium Polymer have about a life of 2-3 years,the LifePo4 batteries could have a life of 5 years plus....but LifePo4 has a lower energy density(is heavier and bulkier)so its difficult to mount in the water bottle position. I did approach a battery supplier at the Shanghai cycle show and we calculated that in the same size bottle it would only be possible to sqeeze 6 Ah of LifePo4 cells against 10Ah LiMn04,6Ah is too small range-for that reason LifePo4 batteries tend to be rack mounted or mounted behind the seat tube.
Dave
Kudoscycles

If I keep my kudos, i will want to change the current battery pack to a frame mounted, Would
2 6amps packs linked not work if they could fit somehow or would that just not be viable.

Once the current battery is knackered I will be looking at bottle type as a replacement.

 

[thomas russell]

Hi everyone,

I've just bought an 8fun kit with a rear rack for battery. The rack like many ebike racks is pretty ugly and has non standard fittings. looks like it's designed to carry two kids and a bag of coal. I've made it fit with bits of alloy bar but I'd love to buy a decent looking rack. Search as I may I cant find anyone who can supply a decent rack. Has anyone any suggestions? the present rack has the control box at the front facing down. It's the one shown here
Aliexpress.com : Buy BTN 36V9Ah Japan battery for ebike from Reliable battery for ebike suppliers on BTN HOLDING GROUP CO.,LTD
and that is the kind of rack I want to replace the monstrosity
thanks for any help.

 

[Deleted member 4366]

Make your own rack. It's very easy . You don't need the bag:
http://www.pedelecs.co.uk/forum/electric-bicycles/14308-how-make-rack-battery.html

A photo of your battery would help us to give more specific solutions.

 

[thomas russell]

Make your own rack. It's very easy . You don't need the bag:
http://www.pedelecs.co.uk/forum/electric-bicycles/14308-how-make-rack-battery.html

A photo of your battery would help us to give more specific solutions.

Hi
Thanks for that,
If I cant find a ready made I may opt for that.
The battery is exactly like the one shown in the link.

Regards
Thomas