i have a battery size 15inch by 4.5inch by 4.5inch. i would like to know what technology provides the most amphourage in this size of battery. this question is for the physics/chemistry professors on this forum if there are any. i know of lithium and NiMH batteries etc. , but has anyone tried a fuel cell?
battery question for scientists
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Fuel cells aren't available yet, but hydrogen ones have been tried on e-bikes and recumbent trikes. Costs will be very high initially.
The lightest present technology is lithium iron phospate, but they aren't readily available in e-bike useful sizes yet, or at an acceptable cost.
The lightest practical batteries are Lithium ion manganese and their Li-polymer variant, usually shortened to Li-ion or Li-poly. A 10 Ah one of 26 volts (the nearest voltage) which you could use with your bike would weigh about 2.5 kilos at most. The lowest cost mainstream one is £199, but it's ability to deliver current at a rate your motor would demand might be in question. It's intended for use at three quarters of the motor power of yours.
The equivalent 8.5 Ah 24 volt NiMh one would be about 4 kilos, and cost £129. That could deliver the current your motor needed.
These batteries would all be a bit smaller than your present one.
.
The lightest present technology is lithium iron phospate, but they aren't readily available in e-bike useful sizes yet, or at an acceptable cost.
The lightest practical batteries are Lithium ion manganese and their Li-polymer variant, usually shortened to Li-ion or Li-poly. A 10 Ah one of 26 volts (the nearest voltage) which you could use with your bike would weigh about 2.5 kilos at most. The lowest cost mainstream one is £199, but it's ability to deliver current at a rate your motor would demand might be in question. It's intended for use at three quarters of the motor power of yours.
The equivalent 8.5 Ah 24 volt NiMh one would be about 4 kilos, and cost £129. That could deliver the current your motor needed.
These batteries would all be a bit smaller than your present one.
.
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The two lower cost batteries I mentioned are those supplied by Powacycle for their bikes:
The NiMh one is the Battery for Windsor @ £129
The Li-polymer one is the Battery for Windsor LPX @ £199
Here is the link to the batteries page on their site, where you'll see them listed.
With both types you'll need to have the correct charger, and Powacycle have those at low prices to suit.
Of course these batteries are configured for their bikes, so you would have to either transfer the entire contents and charging connectors to your case, or devise a connection method to adapt to your bike.
If transferring the LPX type content, be especially careful to mount the pack and it's integral electronics securely and protected against movement damage, since lithium batteries are potentially dangerous if mishandled and damaged.
.
The NiMh one is the Battery for Windsor @ £129
The Li-polymer one is the Battery for Windsor LPX @ £199
Here is the link to the batteries page on their site, where you'll see them listed.
With both types you'll need to have the correct charger, and Powacycle have those at low prices to suit.
Of course these batteries are configured for their bikes, so you would have to either transfer the entire contents and charging connectors to your case, or devise a connection method to adapt to your bike.
If transferring the LPX type content, be especially careful to mount the pack and it's integral electronics securely and protected against movement damage, since lithium batteries are potentially dangerous if mishandled and damaged.
.
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