When the battery wears out, what exact type of replacement battery does it need?

We use a 12V, 10 AH Lithium Battery. Hope that helps.

Do you have an online user manual and instruction?

You can find the instruction and user manual here: https://nisplaysports.us/pages/instruction

why does my ball NOT shoot at the same height and location?

It is likely due to using a mix of new and used tennis balls (pressurized) with the ball machine, as they have different pressures and will shoot at different heights. There is nothing wrong with ball machine, and it is normal for all tennis machines, and the resolution is simply to replace them with new tennis balls or use pressure-less tennis ball.

what's the return policy?

We offer free returns and exchanges for any broken or defective ball machines. However, for any other returns, such as no longer wanted, the product is not as expected, etc...you may return it to us in “like-new” condition within 30 days of purchase, subject to a 15% restocking fee. Customer is responsible for return shipping. Damages to the machine that require repair will be done at the customer's expense in addition to the restocking fee.

Age Range	Youth
Color	Black and Red
Size	12.5'' x10.6'' x 12.6'' (342732cm)
Style	N1 Ball Machine + Oscillator Combo
League	tennis
Construction	[INF] Likely specific to tennis ball machines, involving the use of aluminum and other materials in its construction.
Material Type	Aluminum
Number of Items	1
Outer Material	Aluminum
Sport	Tennis
Included Components	Ball Machine, Battery and Battery Bag, Charger, Oscillator, Remote Controller
Batteries Included?	Yes
Brand	Nisplay
Department	unisex-adult
Manufacturer	Nisplay
Item model number	N1
Product Dimensions	45 x 38 x 47 cm; 11.79 kg
ASIN	B0BSB7J969

Portable Tennis Ball Machine (26lbs) - Dual Motor for TopSpin and Backspin, 80+ Balls, Max 68MPH, 4+ Hours Play with External Lithium Battery

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