In all honesty, nothing beats the LiPo4 batteries at this moment!
If your bike is truly 250W like you say, it uses I=P/U=250/48=5.21A. If you want to use the battery pack independently, You must select batteries more powerful than 5.02A!!! 4.5A is not good enough!
. If you want to use them in combination with the internal battery, any type of 12V battery could do.
The cheapest battery from BMSBattery will be more than enough!
The issue is the following:
Put in those 2 extra lead acid batteries from amazon, with convertor, and your bike will drive only marginally longer (20% max).
put in 4 acid batteries, 7A in series, and connect that in parallel with your current 48V20A battery and your range increase will be ~35% (minus the weight would be around 30% increase).
Your theoretical mileage per charge would be:
45km to almost 60km
60 km to almost 80 km.
You will have between 15-20km increased range max, but these batteries only last 250 cycles, remember that.
4 of these batteries weigh 25LBS, or 12kg.
@$25 per battery for a 7A battery,that's $100 total, they are large, and pretty heavy. They have a max charge cycle of 250 cycles
, so in the long run, you're going to be spending the most money on these. In the short run these are your best option though (say,it's a good option for
using the bike one year or less
Second option is to put in the cheapest 10A Li ion batteries, @$233, and your mileage will increase by 20%, and puts you in the +10KM you wanted, but if you ask me is not the best option.
45 km to 55 km
60 km to 70 km
They are lightweight @ only 2.8kg
!, powerful, and when using them in parallel with your current battery they will provide more amps and slightly higher voltage to your engine, resulting in more torq, tiny bit faster driving, and longer mileage.
Though if I where you, I'd replace the engine to a more powerful one. 250W engines are used to propel pedal (manual)bikes, not scooters.
When you do this li-ion mod, make sure the controller and engine stay cool!Li or Li-ion batteries last you for 800 charges
, that's over 3x longer than the lead Acid batteries, and usually have less issues too;
They are a better alternative, something you will benefit from financially if you ride your bike daily, for 2 to 3 years.
On BMS battery they don't sell LiMn batteries, but they are known to have 1000+ recharge cycles. Good for upto 4 years of daily use or 5,5 years of ordinary use.
Your last option, is most beneficial in the long run IF
1- your bike does not get stolen,
2- Your bike does not get into an accident
3- You are not going to sell it, but keep driving it regularly:
4- Your bike does not overcharge (as this can cause fire, or damage the bike) or run dry empty for months (as this impairs the batteries).
In other words, if you will use it daily, and take care for it, the more expensive LiPo4 (or LiFePo4) batteries should pay you back your money over time!
. They are rated 2000-4000 recharge cycles max. The cheapest one from the store will increase your mileage the same as the Li ion ones, by 20% (the 10A, $278.10 one). You will be paying only $45 more than Li-Ion batteries, but they last you more than twice as long, anywhere north of 5 years.
No one has experienced it yet, as these are quite new, (literally I've only heard of it for the first time this year, the newest production samples should be about a year out on the market, but according to the specs they should last almost 7 years.In the long run these are the best solution!
your best solution would be to buy the most expensive battery, as it will increase your current range by a 100%!
That means, if you buy the $530.10 battery, and connect it in parallel, (you will also need to buy a more expensive charger); your mileage would be:
from 45km to 90km
From 60km to 120km. (an increase between 45 and 60miles per charge)
The MBS Batteries should fit in your helmet compartment. Measure it, and verify with BMS (battery sizes are on their site) here: http://www.bmsbattery.com/56-48v?orderby=price&orderway=asc
I help you in all of this, because I have bought an Xtreme BX-700Li and am currently in the process of researching extending my range too. That's why I can help you in all of this, and share my finding! Whatever you choice you end up taking, please let the community know,so we can learn from your experiences!
Save this site in your bookmarks in case of something happening (like battery breakdown or so), so you can tell us about your experiences!
Don't be affraid to buy a battery with a too high amp rating. The higher the amps, the longer your mileage. They should almost be linear, meaning, a 10A battery has half the mileage as a similar battery with 20Ah rating.
And like mentioned, your 250W engine needs at least a 5.2A (that is a 7a) battery (because there are no 5.2A batteries on the market. There are 6A batteries on the market, but the problem with these is that when the voltage drops below a point still ok for the battery, your controller will shut down,and your mileage will be very low. So it's better to get at least 7a batteries, unless you plan on using them alongside the other battery, to re-inforce the amps.