Having extra batteries on hand is a great way to extend a party ride and is an important safety precaution if you use your DLG heavily.
Remember that these battery packs are not waterproof. The simplest way to protect the battery if you need to ride in the rain is to enclose it in a Zip Loc bag.
Weighs one pound
Matches the connector on your DLG lights
Has it’s own foam cushion built in to ensure it won’t pop out if you hit a bump.
Environmentally friendly rechargeable cells are good for 500-1000 full charge cycles. (Still, don’t toss it in the garbage when you’re done; bring it to a battery recycling center instead.)