How long does the batteries that come with it last between charges?

This depends on what you're using it in. I have one in my Lenovo active pen 2. I charged it once when it arrived almost two months ago and it has yet to finish draining. I use the pen most weekdays for 3-5 hours as I do stuff on zoom. These are nimh batteries (1.2v) so they won't work perfectly in all things that take 1.5v alkaline. And nimh usually have a capacity rating of 50-75% of their alkaline counterparts. So if you were to use it in a flashlight for example, I would expect half the runtime of disposable batteries with a bit less brightness. For most uses, the fact they're rechargable makes up for the capacity.

How do you tell if it's charged? Mine didn't have the indicator light as described.

Mine has a small LED indicator light on top.

This is listed as Prime, so why does it take 5 days to arrive for a Prime member?

Haha, you'll find this as "funny" as I did when Amazon customer service had to explain it to me (for a different product). Prime guarantees "2 day shipping." That does NOT mean it gets shipped immediately. Any 3rd party seller can take however much time they need as long as the method they ship it by is "2 day" delivery. So order it today and one month from now the seller can ship it with overnight and still fulfill "prime" shipping. What a joke right?

Can the usb charger also be used for aaa and aa size nimh batteries? thanks.

You can recharge AAA or AAAA rechargeable batteries with this USB charger.

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🔋 Power smarter, live greener — never run out when it counts!

SPEEDY RECHARGE - Get back to full power in just 45 minutes—no more waiting around.
SMART SAFETY TECH - Auto trickle charge & short circuit protection keep your batteries safe and long-lasting.
PERFECT FOR PRECISION - Optimized for Surface Pen & active styluses needing stable 1.5V output.
PLUG PLAY CONVENIENCE - Includes smart charger and 2 AAAA batteries—ready to power your devices right out of the box.
ENDLESS POWER ZERO WASTE - Recharge up to 1200 times and ditch disposable batteries for good.

The ANVOW Smart AAAA Battery Charger comes with 2 rechargeable Ni-MH AAAA batteries (1.2V, 400mAh) designed for up to 1200 recharge cycles. Featuring fast 45-minute charging, smart safety protections, and eco-friendly materials, this kit is ideal for Surface Pen and other active stylus devices requiring consistent 1.5V power. Compact and efficient, it offers a sustainable alternative to disposable batteries with lifetime technical support.

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Brand	ANVOW
Manufacturer	ANVOW
Model	AAAA/ CP-C-001
Product Dimensions	14.84 x 17.42 x 4.52 cm; 31.75 g
Batteries	2 AAAA batteries required. (included)
Item model number	AAAA/ CP-C-001
Compatible Devices	Controller
Voltage	1.2 Volts
Power Source	battery powered
Charging Time	45 Minutes
Batteries Included	Yes
Batteries Required	Yes
Battery cell composition	NiMH
Includes Rechargeable Battery	Yes
Manufacturer	ANVOW
Country of Origin	USA
Item Weight	31.7 g

ANVOW Smart AAAA Battery Charger with 2 Counts Rechargeable AAAA Batteries - Ni-MH 1.2V 400mAh 1200 Cycles Surface Pen Active Stylus Rechargables Battery

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