Battery blender

[Bronco99]

I?m having a Samsung 48v 19.5ah battery made up to go with my 48v standard rad battery on rr plus. When it comes to blenders, can anyone tell me the difference between the Datex2:

https://biggamebikes.com/product/datex2-parallel-battery-adapter/

and the much more wallet friendly VGBEY:

https://www.amazon.co.uk/VGEBY-Electric-Accessories-Discharge-Converter/dp/B0BZHLJQBC/ref=pd_aw_ci_mcx_mh_mcx_views_0?pd_rd_w=8NfX8&content-id=amzn1.sym.6466ed1c-11ca-4b0b-9aca-60e7ab0b0c4d%3Aamzn1.symc.acfafb1d-071f-4fdf-beff-aca206a47be9&pf_rd_p=6466ed1c-11ca-4b0b-9aca-60e7ab0b0c4d&pf_rd_r=Z0874WA0A32ZTCZF3G4F&pd_rd_wg=Oqlqb&pd_rd_r=564fc256-0e67-4976-8407-6f48a374d573&pd_rd_i=B0BZHLJQBC

Thanks!

[Bronco99]

A better question would be, what is the best value battery blender for a second battery on a rad runner plus with an EggRider display?

Thanks

[petermcg]

Since both of your batteries are the same voltage (48v), you don't need the Datex2.  The amazon option is fine, and actually you could just get away with connecting the batteries directly in parallel (which is what I do using this - https://ebikes.ca/shop/electric-bicycle-parts/battery-accessories/dualbattcable.html).

[Bronco99]

Thanks for the info Peter. No need to pay over the odds for fancy gadgets I guess! Now I just need to find one for sale on my side of the pond. 

[Bronco99]

To return to this question, I?m going with the cheaper option because the batteries are both 48v. But I wonder will this still increase performance the way Datex2 claims to, or just battery life? Will both batteries charge at same time? I?ve always been told you should only run parallel if the batteries are same brand, capacity, age etc? Maybe this only applied to the lead acid being discussed at the time?
Thoughts appreciated 👍

[petermcg]

To return to this question, I?m going with the cheaper option because the batteries are both 48v. But I wonder will this still increase performance the way Datex2 claims to, or just battery life? Will both batteries charge at same time? I?ve always been told you should only run parallel if the batteries are same brand, capacity, age etc? Maybe this only applied to the lead acid being discussed at the time?
Thoughts appreciated 👍

You will not be able to charge both batteries at the same time, just use them at the same time.  Most batteries are charged via a separate connection anyways.  For my setup, I have two 52v 20ah batteries that I use in parallel with a dumb cable, and I carry two chargers, one for each battery.  The reason why charging should be separate is because as one battery completes its charge, it will take less current in and the remainder will be dumped to the less charged one, and if you are using a high current charger (a fair assumption given you are trying to charge two batteries in parallel), the high current to one battery will be detrimental.

[Bronco99]

Ok mate good info thanks. But will a cheaper blender (not a datex) equalise  2 48v batteries regardless of voltage level or do they need to be equal voltage beforehand. I?m trying to figure exactly what the datex does as opposed to a (much) cheaper blender 😂