Aventon Level battery replacement

[flyingjack]

Is there a cheaper version of the Level battery that I can buy for a spare? Doesn't have to have as much power; only fit on the bike. I'd like a backup for longer uphill trips if needed to get home.
Thanks

 

[flyingjack]

No, I pulled off a larger/softer seat from my mtn bike. Also, ordered a
Bike Seat Shock Absorber Spring Steel Bicycle Saddle Suspension Device with Scale for Mountain Road Bicycle

Qty 1
$24.99 from Walmart. Researched suspension systems and this sounded so simple and effective.