Battery Range on new 52 volt 15 amp Rize RX

Robertsailor

New Member
Region
Canada
We have just ordered 2 new Rize bikes. I ordered the RX model with the 1000 watt mid drive engine. Last years bikes with the same engine were 48 volt 19 amp batteries, which are decent wattage and pretty good range. Rize is trying to sell more batteries this year and I'm trying to decide whether I need a second battery. We do live in a hilly area however most of the miles will be put on will be on flater ground.....so question....if you were using lots of peddle assist....what might one expect for mileage?
 

theemartymac

Well-Known Member
Generally the range may not improve much if at all with a 52V battery, but it will stay above the 48V ideal voltage longer so you shouldn't see the power delivery fall off so quickly below 50% like the old ones. The low voltage cutout is also higher in the 52V, so it will shut down around 44-46V, vs 40-42 for the old 48V batteries.

Time will tell how it pans out once the new models are delivered, and whether or not there are any firmware updates with this years models. My last-years RX Pro gets anywhere from ~30-35kms on PAS 4 Sport using very high assist and high throttle usage, to ~60-70kms on PAS 2 or 3 in eco. I am sure I could stretch it further if I really wanted to maximize the range, but it would require very low assist and some concerted effort.

I just recently updated some settings on my Ultra (Last years model), and I seem to be getting maybe 10% or so better range now. Still evaluating...
 

Timpo

Well-Known Member
We have just ordered 2 new Rize bikes. I ordered the RX model with the 1000 watt mid drive engine. Last years bikes with the same engine were 48 volt 19 amp batteries, which are decent wattage and pretty good range. Rize is trying to sell more batteries this year and I'm trying to decide whether I need a second battery. We do live in a hilly area however most of the miles will be put on will be on flater ground.....so question....if you were using lots of peddle assist....what might one expect for mileage?
I didn't know Rized had 52V 15Ah, but..
Assuming you're on the same power setting (watt rating), you will get less mileage.

52V x 15Ah = 780Wh
48V x 19.2Ah = 921.6Wh

780Wh ÷ 921.6Wh = 84.63%

So by switching to 52V 15Ah battery, you will get 84.63% of what you get with 48V 19.2Ah battery.
Or you will lose 15.37%, whichever you wanna call it.
 

theemartymac

Well-Known Member
I didn't know Rized had 52V 15Ah, but..
Assuming you're on the same power setting (watt rating), you will get less mileage.

52V x 15Ah = 780Wh
48V x 19.2Ah = 921.6Wh

780Wh ÷ 921.6Wh = 84.63%

So by switching to 52V 15Ah battery, you will get 84.63% of what you get with 48V 19.2Ah battery.
Or you will lose 15.37%, whichever you wanna call it.
Good catch, I hadn't even noticed that the new batteries were smaller.

Makes that 30Ah dual battery option much more appealing. Although the price is getting up there now...
 

Robertsailor

New Member
Region
Canada
Thanks for the feedback, much appreciated. Yes like you I'm thinking Rize is upping their margins by selling additional batteries...if I could get maybe 55-60 k on the 15 amp battery using reasonable peddling power I'd probably pass on the extra battery but if not I'd have to dig deeper for the 2nd battery. It will cost me an additional 200 bucks over the current price if I order it after delivery so just trying to do some due diligence that might allow me to make a more informed decision.
 

theemartymac

Well-Known Member
Thanks for the feedback, much appreciated. Yes like you I'm thinking Rize is upping their margins by selling additional batteries...if I could get maybe 55-60 k on the 15 amp battery using reasonable peddling power I'd probably pass on the extra battery but if not I'd have to dig deeper for the 2nd battery. It will cost me an additional 200 bucks over the current price if I order it after delivery so just trying to do some due diligence that might allow me to make a more informed decision.
I suspect you could pull that off if you are cautious, although a couple of points to keep in mind:

1. The Ultra cannot be pedaled effectively without power (i.e. dead battery), as the mid-drive does not have a clutch (so you have to turn the motor to pedal). It is an absolute bear without power, and would bring you to tears on even a moderate hill.
2. As Rich mentioned, Cold weather performance does decrease below say 15C, and dramatically so below 5C. Not a problem for most summer riders, but worth bearing in mind. My experience is up to 50% range reduction below 10C, and I need an entire battery just to get to work (~25kms). A neoprene battery cover or similar can help keep the range around 70% or so of normal summer performance.

For comparison, I also have a Rize X with the 750 Hub, and It pedals just fine with no power, and I can stretch it's legs to 100kms with relative ease. I don't bring a spare battery with me on that one because I know I can get home regardless. I don't dare take the Ultra beyond 50km rides without my spare. YMMV! :)
 

steve mercier

Well-Known Member
Get the double battery option now while you can. Plan on embracing Ebiking. We have a rider in our group who has Rize with a 17 Ah battery and he is limiting the range and scope of trips ( hills and distance) the rest of can do with our extra batteries when he joins us. Every trip I tell him to get a second battery.
 
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Robertsailor

New Member
Region
Canada
Again more quality information courtesy of people with a much deeper knowledge base than me...thanks a million....I'm now thinking of biting the bullet and buying the second battery.
 

Falko

New Member
Generally the range may not improve much if at all with a 52V battery, but it will stay above the 48V ideal voltage longer so you shouldn't see the power delivery fall off so quickly below 50% like the old ones. The low voltage cutout is also higher in the 52V, so it will shut down around 44-46V, vs 40-42 for the old 48V batteries.

Time will tell how it pans out once the new models are delivered, and whether or not there are any firmware updates with this years models. My last-years RX Pro gets anywhere from ~30-35kms on PAS 4 Sport using very high assist and high throttle usage, to ~60-70kms on PAS 2 or 3 in eco. I am sure I could stretch it further if I really wanted to maximize the range, but it would require very low assist and some concerted effort.

I just recently updated some settings on my Ultra (Last years model), and I seem to be getting maybe 10% or so better range now. Still evaluating...
I also have last year's model of the RX Pro and have been wanting a second battery. I soooo want to get a 52v battery, but Rize says it won't work on last years RX Pro. It is a 48v controller. Then hardcore ebike people tell me the Ultra can handle the 52v no problem. Have you tried a 52v on yours?
 

theemartymac

Well-Known Member
No, I have 2 batteries already, but I also suspect it would work. Another 'But' - the range via the display would not be accurate (or even a little useful) unless there was a 52V setting in the controller/display. You would have to go by the LED's on the battery head, which are also notoriously inaccurate. You would need a separate charger as well, as the stock charger only goes to 54V, but a 52V battery needs 58 to be full. And keep them straight at the house so you don't overcharge the 48V.

Once the warranty is off though, a new controller and display to make the upgrade aren't that expensive. Batteries are though, and I don't think there would be an easy way to use both a 52V and a 48V battery without constantly changing the settings in the display? I'd suggest either just buy a second battery, or double down and go all in with a new battery and controller straight off (DAMN THE WARRANTIES CAPTAIN!!), and sell the other battery while it's still brand new, but that's probably not the most cost effective route on a new bike. ;-)