split charge relay to charge two 6v 4.5ah batteries

[waigyuk]

I have two maplin 6v 4.5ah batteries wired in series to power my dashcam while parked.
The batteries are similar to this one :

Will this split charge relay be ok to re-charge the batteries while driving?
Maypole 292 20A Caravan Dual Charge Relay Kit: Amazon.co.uk: Car & Motorbike - https://www.amazon.co.uk/Maypole-292-Caravan-Charg...

My car is a 2006 Vauxhall corsa C.