Can't decide on second battery.

[boytitan]

I currently have a 48 12 ah battery in the triangle of my frame I plan on adding a second one for increased range. Having a 1000 watt motor even with heavy pedaling my range suffers a bit. So I planned on upgrading my 44 tooth crankset to a 51 tooth and adding a 11 tooth rear then adding a second battery.

I am stuck between wanting a luna mighty mini and a rear rack battery.

https://lunacycle.com/52v-mighty-mini-cube-ebike-battery-pack-panasonic-ga-7ah-3-pounds/

https://bmsbattery.com/ebike-battery/780-48v10ah-case-02-18650-battery-pack-battery.html#/26-ac_voltage-100132vac

The 52v battery is compelling due not so much for its size but its higher voltage. But have been wondering if 52v even gives a decent speed boost if any at all does a 4v difference increase anyones speed. I am getting 28-30 mph top speed average on my current set up and doubt 52 makes a difference.

The other flaw is the weight of the 48v battery its weight is no listed my lifepo4 battery weights quite a bit already more weight would just end up costing me range has anyone used bms rear rack battery that can comment on its weight. Its also compelling because it comes with a spring rear rack and I had planned on buying a new spring rear rack anyways because my current rear rack is being held to the frame with zip ties at the top part and does not give me enough room for a rear fender.

 

[docw009]

I own a Mini 52V in GA cell and also a 48V rack battery, might be GA, and also from Luna. Looks like Luna isn't showing the rack battery. Maybe they dropped it. They never offered a rack.

You'll still have to put the Mini somewhere, probably on your rack. It probably weighs 3 pounds as advertised. My rack battery weighs about 6 pounds. An alloy rack is a pound. Say you have 220 pounds of bike/rider. We're talking 1-3% extra weight. Big time problem for a road rider, but just measurement error for an e-bike. You might see it if you made the same round trip on the same day, using a wattmeter. Three extra stops for a traffic light might make more of a difference?

Performance riders will probably notice 8 pounds above the rear wheel on dirt trails and curving mountain roads. Not an issue for me.

Please advise on the range when you get that second battery. I've yet to run either of my batteries flat.

 

[boytitan]

I own a Mini 52V in GA cell and also a 48V rack battery, might be GA, and also from Luna. Looks like Luna isn't showing the rack battery. Maybe they dropped it. They never offered a rack.

You'll still have to put the Mini somewhere, probably on your rack. It probably weighs 3 pounds as advertised. My rack battery weighs about 6 pounds. An alloy rack is a pound. Say you have 220 pounds of bike/rider. We're talking 1-3% extra weight. Big time problem for a road rider, but just measurement error for an e-bike. You might see it if you made the same round trip on the same day, using a wattmeter. Three extra stops for a traffic light might make more of a difference?

Performance riders will probably notice 8 pounds above the rear wheel on dirt trails and curving mountain roads. Not an issue for me.

Please advise on the range when you get that second battery. I've yet to run either of my batteries flat.

Do you notice a speed increase with the 52 v pack. I am thinking what ever speed increase I get with a 52v pack I can get with simply changing my gearing to 52 by 11. I had bikes with better gearing but had to get a new bike to handle a powerful front wheel e bike build so I can have 2 wheel drive for winter. I did not know the gearing was so torque oriented till today.

At 44 x14 the max rpm I can get comfortably is 90 rpm at 21.87mph above that speed and the motor is doing 90% of the work. At 52x11 that same rpm gives a speed of 32.94 mph thus outworking the motor also since its a harder gear 100 rpm should be achievable comfortably.

I still don't know my range the 1 time I ran it dead I did 12-15 miles on it at max speed did not fully charge it. Then did 8.9 miles near max speed before it went out and it was not fully balanced since I was able to get 5-8mph of assist out of it for the rest of the trip if I eased on the throttle to keep it that low other wise it would die instantly. Since then the battery meter performs more accurate I plan on getting a watt meter currently also.