This battery is about 25% larger than our 2.9ah pack. It still is fairly compact, yet if provides almost twice the power capacity. We built the 5ah battery box platform specifically around this 5ah pack. Now run your fish finders for longer durations prior to needing a charge. May we suggest you purchase two even for your extended trips? Does not fit within 2.9 amp hour kits - ONLY for use with 5 amp hour systems! Do you have a proper battery charger for your battery? We sell a great maintenance charger we recommend for this battery here at this link:
 
https://www.fishfindermounts.com/product-page/800ma-charger
 
Video Link:
 
https://youtu.be/kC0rJnNUuVw