Replacement battery

[Clive Belfield]

Hi folks
I am looking to replace the battery on my ebike conversion kit. It is a 36volt , 250 watt front wheel system with a bottle mount battery. I have read a lot about good cells and bad cells and and am confused.
Can I seek recommendations as to which "good" one to buy

 

[Clive Belfield]

P.S. and where from?
Thanks in anticipation.

 

[vfr400]

Is the controller integrated or separate? Which type of bottle battery is it? How much space do you have? A photo of your bike might help.

 

[Clive Belfield]

I have a separate controller. I am using a standard road bike so plenty of room. Attached picture of bottle battery. Thanks.

 

[vfr400]

You can use any frame-mounted battery you want. Generally, if you buy from a proper retailer, like Eclipse Bikes, you get decent quality and support. I always buy from China (EBay, Aliexpress, BMSBattery, PSWPower, Topbike kit, Elifebike, etc) and I've never been disappointed. Make sure it has branded cells in it, like Samsung, Panasonic, LG. Buying from China is cheaper, but you generally don't get any support.

 

[Nealh]

You could use any battery type and mount it in the triangle, what you need to let us know is the controller current. If it is 15a max then the Sam 29E celled ones are very good and have good cycle life, I have in the past berated the 29E a little but then again I abused the battery by derestricting and applying to many amps. Although abused a little my batteries are now over 5 years old and still return me 30+ miles from a charge albeit I have to only use PAS 2 max for the mileage which is ok for my commuting /errand usage with or without a trailer.
LG MH1 is another good cell which is being used a bit more now and also the Panasonic BD cell (both 3200mah cells), other wise link any you find and we can have a look at the specs. Ideally you are looking for a battery with 5 cells in parallel so a 14.5ah or 16ah battery and ones that actually state which type of battery cell is used in side.
Stay clear of any with LG MG1 cells as they did not perform to well.

 

[Nealh]

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The battery with carrier is quite long approx. 430mm needed to fit it, the rail fitting is all aluminium except the bottom end part which is a plastic cover. For down tube fixing it sits very nicely as it is narrow and plenty options to position for rivnuts fixing or adding extra rivnuts.

 

[jarob10]

EU NoTax 36V 14.5Ah Li-io INR18650-29E electrical ebike battery pack 2A charger | eBay

Find many great new & used options and get the best deals for EU NoTax 36V 14.5Ah Li-io INR18650-29E electrical ebike battery pack 2A charger at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

The battery with carrier is quite long approx. 430mm needed to fit it, the rail fitting is all aluminium except the bottom end part which is a plastic cover. For down tube fixing it sits very nicely as it is narrow and plenty options to position for rivnuts fixing or adding extra rivnuts.

Any reason why

You could use any battery type and mount it in the triangle, what you need to let us know is the controller current. If it is 15a max then the Sam 29E celled ones are very good and have good cycle life, I have in the past berated the 29E a little but then again I abused the battery by derestricting and applying to many amps. Although abused a little my batteries are now over 5 years old and still return me 30+ miles from a charge albeit I have to only use PAS 2 max for the mileage which is ok for my commuting /errand usage with or without a trailer.
LG MH1 is another good cell which is being used a bit more now and also the Panasonic BD cell (both 3200mah cells), other wise link any you find and we can have a look at the specs. Ideally you are looking for a battery with 5 cells in parallel so a 14.5ah or 16ah battery and ones that actually state which type of battery cell is used in side.
Stay clear of any with LG MG1 cells as they did not perform to well.

Any reason why the Samsung 35e isn’t on that list? My replacement 35e celled battery beats its 29e version in current delivery & range

 

[Clive Belfield]

Any reason why
Thanks jorob10, where did you get it from?

Any reason why the Samsung 35e isn’t on that list? My replacement 35e celled battery beats its 29e version in current delivery & range

 

[Clive Belfield]

Thanks jarob10, where did you get your battery pack from?

 

[Nealh]

It's documented on ES that long term cycle testing at 1c by the forum testers shows that 3500mah cells perform worse then then lower mah cells in the long term. Another factor they use is is price per mah and consistently 29E and LG M29 are one of the best cells.
It all boils down to current required and range but cells can't deliver both you have to compromise.

 

[jarob10]

Thanks jarob10, where did you get your battery pack from?

It was hard to find - I ended up going with bmsbattery. 36v 21Ah hailong battery, along with a q128c motor was £400 inc uk delivery. No duty to pay.

I wasn’t aware of the inferior long life cycle issues though. Time will tell, but right now the 35e trounces it’s 29e equivalent for me. I’m getting at least 25% more range with a lot less voltage sag.