Magneto Mini-Gen for 12v battery

[lukecanna]

I am looking to wire up a 12v 7.2amp sla battery to my bike wired to some leds and a front headlight as well as a horn maybe even a phone charger (may need a bigger battery)
I want to charge the battery while running and found one of these mini-generators that goes next to the magneto to charge the battery, will this draw away from the ignition magneto power and in-turn make me lose power or should it be fine?
https://www.ebay.com.au/itm/12-VOLT...rentrq:c0a236ec1650aa4172bc451afffcb597|iid:1

 

[Old Busted Hotness]

It's completely separate from the ignition magneto, so you'll be fine. Probably enough power to run some LED lights but I don't think you'll be charging your phone.