I like these
1set new 1800Lm CREE XM L XML U2 12W LED Headlamp Rechargeable Headlight Head Light Lamp +2x18650 4000MAH Battery + Charger-in Headlamps from Lights & Lighting on Aliexpress.com | Alibaba Group
or these
RA 608 Ergonomic Design head Light XM L2 U2 LED 1200LM Waterproof Bicycle Light LED HeadLamp flashlight with charger Retail box-in Headlamps from Lights & Lighting on Aliexpress.com | Alibaba Group
Plenty of kits around with mains/vehicle chargers and a pair of batteries. Main thing is to get one win an XM-L2 U2. Look closely at the LED and make sure the base is silver and not green.
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