REVIEW: QR-E 250W ELECTRIC BOOSTER BICYCLE MOTOR AND B60i AND B70 BATTERY

[3dxl]

I think Blueberry posted about having opened up a Qiroll battery, you might send him a message about details if he doesn't respond to this thread. I suspect that the plastic cap may be glued onto the aluminum tube which may have to be destroyed in order to open it up. Keep us posted.
On another front I've found that my old used Pro works surprisingly well with the 24v battery from my mute model. I have several Ryobi 18v 4ah power tool batteries that I want to wire 2 in series and see how that works for the Pro.

Thanks for the info, i'll try to contact/pm Blueberry later. Btw how do you connect to alternative battery to Qiroll unit that have 3 terminal plug ends? Does Bafang/Hailong battery pack 48V works on Qiroll?

 

[EMGX]

You only have to use two (+ & -) of the three terminals when using a standard non-proprietary battery. The third terminal isn't required. I think blueberry first posted this information also. I've run my Mute version with both 48v and 36v batteries and a buck converter that can drop voltage up to 60v down to 24v. BTW I've also used a 5v buck converter so the Qiroll or other batteries can be used as a battery bank to charge devices such as phone.

 

[blueberry]

Hey! Yeah you can get the cap off the H70 without destroying it, though it’s rather tedious. I applied heat from a hair dryer and repeatedly slid a thin knife in the gap until enough of the adhesive was weakened to pull off the cap.

Obviously the battery will end up with scratches and you might want to reassemble with extra adhesive of your own at the end, but it should work. Be mindful not to short the exposed terminals and solder joints inside…

 

[blueberry]

Blueberry, if you still check in on this thread, where did you see that they (Qiroll?) say B70 batteries can be used with the Pro? I did message them and all they messaged back is the generic statement that the H70 is for the Pro and the B70 is for the Mute. I ended up buying a Pro and did try the B70 battery from my Mute just to see if it works, which it did but it was just a short test run. I'm planning on riding the Mickelson trail in South Dakota next week (weather permitting) and taking the B70 battery along as a power bank and as a standby for the Qiroll but don't want to run it on low voltage if it could overheat or otherwise damage the motor.

Either an old eBay/AliExpress listing or their website, don’t quite remember where but they definitely said it somewhere. I also tried it out and it did work… personally I wouldn’t worry about overheating with the B70, except perhaps on steep slopes where performance would already be marginal.

 

[3dxl]

Hey! Yeah you can get the cap off the H70 without destroying it, though it’s rather tedious. I applied heat from a hair dryer and repeatedly slid a thin knife in the gap until enough of the adhesive was weakened to pull off the cap.

Obviously the battery will end up with scratches and you might want to reassemble with extra adhesive of your own at the end, but it should work. Be mindful not to short the exposed terminals and solder joints inside…

Hi Blueberry, Thanks for showing up with tips.
At first i thought it was a screw in type of cap like water bottle or jar. Glad you shared about the info that it was lock on adhesive glue.

Question: Was the content inside tight fit with wires dangling about? Fear if i slid a thin blade between the gap it might touch the board or wires and ended up shorting the circuit. Hearing that you mentioned "the battery will end up with scratches" hinted that it was a tight fit inside and thin blade will swing nearby.

 

[EMGX]

Hi Blueberry, Thanks for showing up with tips.
At first i thought it was a screw in type of cap like water bottle or jar. Glad you shared about the info that it was lock on adhesive glue.

Question: Was the content inside tight fit with wires dangling about? Fear if i slid a thin blade between the gap it might touch the board or wires and ended up shorting the circuit. Hearing that you mentioned "the battery will end up with scratches" hinted that it was a tight fit inside and thin blade will swing nearby.

I don't have any need to disassemble a QIroll battery but if I did I'd try using a cheap feeler gauge (smallest of the blades stiff enough to insert between the cap and can) along with careful use of a heat gun (or hair dryer). I'd try to not twist the cap avoiding breaking wires/connections.

 

[EMGX]

Either an old eBay/AliExpress listing or their website, don’t quite remember where but they definitely said it somewhere. I also tried it out and it did work… personally I wouldn’t worry about overheating with the B70, except perhaps on steep slopes where performance would already be marginal.

As always thank you for sharing your knowledge which has been very helpful to me and I'm sure many others based on the 145,000, and counting, views of this QIroll thread.
I'm still planning on riding the Mickelson trail this year, maybe next week if the weather forecast holds. Thunderstorm forecasts held me back from traveling there ealier but I have ridden on the Palouse to Cascades trail, in the north Cascades and over Going to the Sun road in Glacier so far this summer.

 

[Chazmo]

As always thank you for sharing your knowledge which has been very helpful to me and I'm sure many others based on the 145,000, and counting, views of this QIroll thread.
I'm still planning on riding the Mickelson trail this year, maybe next week if the weather forecast holds. Thunderstorm forecasts held me back from traveling there ealier but I have ridden on the Palouse to Cascades trail, in the north Cascades and over Going to the Sun road in Glacier so far this summer.
View attachment 197873

Wow, beautiful, EMGX!

 

[blueberry]

Hi Blueberry, Thanks for showing up with tips.
At first i thought it was a screw in type of cap like water bottle or jar. Glad you shared about the info that it was lock on adhesive glue.

Question: Was the content inside tight fit with wires dangling about? Fear if i slid a thin blade between the gap it might touch the board or wires and ended up shorting the circuit. Hearing that you mentioned "the battery will end up with scratches" hinted that it was a tight fit inside and thin blade will swing nearby.

I don’t think you need to worry too much while you work on the adhesive in the gap, just be careful when you actually remove the lid. You also might want to make a mark on your blade (or feeler gauge like EMGX suggested!) the length of the cap, that way you know where to stop before it can curve around and towards the BMS.

 

[3dxl]

I don’t think you need to worry too much while you work on the adhesive in the gap, just be careful when you actually remove the lid. You also might want to make a mark on your blade (or feeler gauge like EMGX suggested!) the length of the cap, that way you know where to stop before it can curve around and towards the BMS.

Thanks for the tips, will do.

Reply for Qiroll Support:
Got reply from the support (Mr. Jason).

• Probably the probably 400W+ unit tested on with that battery was hit hard caused by over power consumption more than BMS can handle...still on test phase. Yes that battery was on Prototype Qiroll 400W+ unit.
• He says not recommended to disassemble or mod it (but i'll take the risk anyway).
• Will help out with after sales support on new battery (but i'll have to do few round with old H70 battery first with some test before i hit the shopping cart).

This week i will do a daily "trickle charging" on that problematic battery and do a few test run to see if i can restore to proper "power per mileage" performance before going through the blade under that cap. Will inform you guys about my findings.

 

[Chazmo]

This week i will do a daily "trickle charging" on that problematic battery and do a few test run to see if i can restore to proper "power per mileage" performance before going through the blade under that cap. Will inform you guys about my findings.

Excellent.

3, can you describe the equipment and process you use to do the trickle charging? Some of the other hobbyists have restored batteries (especially power tool batteries that they use for range extenders) by doing this. It sounds interesting, and I’m wondering about it. TIA.