BBS02 battery from EM3EV

Ezwaqs

Just Joined
Apr 7, 2021
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Will be purchasing a BBS02 kit from PSWPower Germany warehouse this week and will be sourcing a battery from EM3EV after reading up posts on this forum it is the place for batteries.
Wanted to ask for recommendations for a 48V from EM3EV as they have a few on offer.
I understand more Ah is more range which is what I want.
Really wanted people with knowledge to give opinions/recommendations.
48V (13S5P-HG2) EM3ev Jumbo Shark 14.8Ah £409
48V (13S4P- GA) Super Shark 13.6AH £274

The super shark will be easier than the jumbo to remove from the frame and is my preferred choice.
Likewise any other recommendations/advice will be appreciated. I believe the 30Q is the bees knees but is out of stock.

Also concerning chainline issues I will be purchasing the Lekkie 42t and fingers crossed it will be good!

My bike is a Specialised Rockhopper Comp 2014.

Many thanks to all on this forum your insight is invaluable:)
 

Fordulike

Esteemed Pedelecer
Feb 26, 2010
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48V (13S5P-HG2) EM3ev Jumbo Shark 14.8Ah £409, that's the exact same battery I'm running with a BBS02. The cells are top notch, on par with my previous 30Q pack, although that one was only 12Ah, so slightly less suited for my set up.

I've maxed out my BBS02 using a programming cable, which means that I went for a battery that could handle repeated high current loads. The inbuilt bluetooth links with an app and provides valuable data on charging and cell health, as well as other useful data.

I added some extra mounting points for the frame, as I felt that using only the 2 water bottle mounting points, was a bit risky for the terrain I ride on. Didn't fancy my expensive battery flying off at some stage.

The super shark should be ok also, as long as you don't go mad with programming the controller.

As for the Lekkie Bling Ring 42T, I can highly recommend that too, as it has improved my chainline somewhat. I have absolutely no problem with any of the gears on my 8 speed cassette.

Don't forget to fit at least one hydraulic brake cut-off, as a BBS02 will destroy the drivetrain without them. If you only fit one, then it must go on the lever for the rear brake.
 
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Nealh

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Aug 7, 2014
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Lots on ES about 30Q and they seem to have a propensity to self discharge.
HG2 top cells as are GA if you want to use high current more then HG2.
I see both capacities are reduced a bit so assume they are using a BMS with lower balance voltage so may be 41.5v ?
 
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Ezwaqs

Just Joined
Apr 7, 2021
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48V (13S5P-HG2) EM3ev Jumbo Shark 14.8Ah £409, that's the exact same battery I'm running with a BBS02. The cells are top notch, on par with my previous 30Q pack, although that one was only 12Ah, so slightly less suited for my set up.
How you finding the range on the jumbo? Also do you notice any power loss at less than 50% charge?
 

Fordulike

Esteemed Pedelecer
Feb 26, 2010
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How you finding the range on the jumbo? Also do you notice any power loss at less than 50% charge?
Range is about 15 miles until I notice a drop in performance, but bear in mind that I have programmed the controller to draw more amps in most situations. I reckon that on PAS 1, my lowest performing mode, I could get 40+ miles.

I haven't done any definitive testing, but I would guess that there is only noticeable voltage sag at less than 30% charge.
 
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Ezwaqs

Just Joined
Apr 7, 2021
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Might just get the 52v 13.6a GA or 52v 17a 35e , concerned with overloading the controller/motor so am I right in thinking a 52v battery charged to 90% will reduce any excess stress on the motor/controller compared to a 100% charged 52v ? Plus charging to 90% will increase the longevity.
 

Fordulike

Esteemed Pedelecer
Feb 26, 2010
3,686
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I'll let Nealh answer the technical questions, but just make sure you buy a battery voltage that matches the BBS02 from PSW Power. Otherwise, you may get an overvoltage error if using a 52v battery with a BBS02 48v firmware controller. Likewise, if using a 48v battery with a BBS02 52v firmware controller, the display may show the battery level incorrectly.
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
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35e are so so cells not designed for high current so stick with GA.
There is world wide shortage of decent 18650's at the mo, the UK supplier I use is only able to get one type of cell at the mo, direct form the Taiwanese factory so t least they are genuine.
Only buy cells from trusted sources to avoid the fakes.
 

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