48v e-bike battery

I recently bought a preowned Smartbike M3. I haven’t been getting the speeds I was expecting from the battery motor pairing though. The battery is a 3 cell 48v 16ah. Motor is a bafang 48v 250w (when I scan the QR code on the motor it says RM G0C0.D 11 F2VA110061). Controller says...

If interested, call Hangzhou Confluence at +86 18868121883 or email [email protected]. The MOQ is 29 Pcs. The Sale Price is $141.85 USD /Pcs(Not include Freight&Tariff Fees). The UN38.3 and MSDS Certificates are in the attachments.[Location: China]. Model 48V/20Ah Nominal...