CTA Digital Mini Battery Charger for Canon NB4L CTA DIGITAL MRNB4L Mini Battery Charger for Canon NB4L. The CTAs, slim, lightweight, and stylishly designed mini rapid charger plugs directly in to your wall outlet and charges your digital camera or camcorder batteries in approximately 60 to 90 minutes. Its unique flat pin, foldable design allows easy storage and makes it the most compact battery charger on the market. The kit includes a universal 110 to 240V AC power source, plus a European plug for global travel and worldwide usage and a car adapter for charging while driving.