This is Mark’s Tech Vlogs review of the XTAR 1.5V 4150mWh rechargeable batteries, a product designed specifically for smart home devices where reliability and consistent voltage actually matter.
A rechargeable battery review might not sound exciting, but I’ve been using the XTAR 1.5V 4150mWh rechargeable batteries since mid-July and I genuinely cannot kill them.
That’s the review. See you soon…
Alright, I’m joking — but as far as a verdict goes, these are very good.
Review transparency
XTAR reached out and offered to send over the XTAR 1.5V 4150mWh rechargeable batteries along with their USB-C charger for review. I didn’t pay for these, but this is not a sponsored review. If anything, XTAR probably assumed this review was never coming.
Pricing and value
A pack of four XTAR 1.5V 4150mWh rechargeable batteries costs around £24, which makes them more expensive than average rechargeable batteries. An eight-pack bundled with the XTAR USB-C charger comes in at roughly £63, which saves a bit overall.
You’re paying for consistency, protection, and suitability for smart home gear rather than just raw capacity.
XTAR 1.5V 4150mWh battery specifications
- Capacity: 4150mWh
- Nominal voltage: 1.5V
- Low-power output: 1.5V
- Charging current: 0.45A
- Built-in protection
- Operating temperature: -20°C to 60°C
- Rated lifespan: up to 1200 charge cycles
The key thing here is that the XTAR 1.5V 4150mWh rechargeable batteries maintain a stable 1.5V output, which is exactly what many smart home devices expect.
Real-world smart home usage
These batteries are marketed for smart home products, so that’s exactly how I’ve been using them.
Smart radiator valves
I’ve been running four XTAR 1.5V 4150mWh rechargeable batteries in smart radiator valves — initially Habi TRVs and later Aqara TRVs — for a combined period of around four months.
They’re currently still reporting 100% battery. For comparison, I also have Aqara TRVs using regular AA batteries that are also at 100%.
Aqara advertises up to two years of battery life when using Zigbee, so the XTAR batteries are performing exactly as well as standard alkaline AAs in this scenario.
Smart cat flap
I’ve also been using the XTAR 1.5V 4150mWh rechargeable batteries in a Wi-Fi smart cat flap from Sure Petcare. It reads microchips, communicates with a hub, and sends notifications. I’ll be doing a full review of that separately.
The previous non-smart version of this cat flap used to get through a set of batteries roughly every nine months.
I installed the XTAR batteries in August, and by late January they finally needed recharging — around five months of real-world use.
That’s particularly impressive given the manufacturer claims around six months of battery life.
Compatibility notes
I originally planned to use the XTAR 1.5V 4150mWh rechargeable batteries in my Aqara video doorbell, which is a serious battery drain if it isn’t mains powered.
While the batteries did power the doorbell, notifications stopped working and live video streaming failed. Oddly, similar 1.5V rechargeable batteries from other brands do work, but in this case the XTAR batteries just weren’t fully compatible.
It’s not a deal-breaker, but it’s worth knowing.
Design and setup
There’s not much to say here — they look like batteries.
You charge the XTAR 1.5V 4150mWh rechargeable batteries by placing them into the XTAR USB-C charger and waiting for the indicator lights to turn green.
You install them in your devices exactly like normal AA batteries.
Final verdict
If you’re looking for reliable, high-quality rechargeable batteries for smart home devices, the XTAR 1.5V 4150mWh rechargeable batteries are well worth a serious look.
They’ve performed beyond my expectations, matched or exceeded standard AA batteries in low-power smart home devices, and removed the constant battery-swap frustration.
For smart radiator valves, sensors, and connected devices that demand stable voltage, these are an easy recommendation.
Pick up the XTAR 1.5V 4150mWh rechargeable batteries
