Charger is coil whine galore…
The battery is good, 2.5Ah is a 5cell battery is good!
(it and the 4Ah are vfm)

Perfect, it has made things much easier for me and the preheating time is more than satisfactory.
Definitely for professional work a second battery is needed

I have bought 3 sets, the battery of the first one died after 4 years. For daily use in the company's vacuum cleaners, it is just fine, both in terms of capacity and weight

Reliable products from Einhell with good battery autonomy and quick charging from the included charger.

It's too early for me to have a complete opinion about the battery. I will return after 60 days.

Update: Completely satisfied with the battery.

I have several Einhell 18v devices.
I would prefer a more affordable battery set solution rather than the free charger that is not included.
This here is the most economical option for purchasing a battery.

For light use in a household/car vacuum cleaner, it is very good! It easily covers my 130sqm house with just one charge

Use for 2 years now, charging every 2 to 3 days, so relatively sufficient use. The use is only with the company's vacuum cleaner.
No problem. The charger charges quickly.
The 4amh battery should be used as a minimum for use in vacuum cleaners in my opinion.

I have bought them for an electric vacuum cleaner.
The battery lasts quite a long time and the charger fully charges it in about three hours

Fast charging. The battery lasts enough to comfortably do your work. I would recommend the larger one if it's for more systematic use.

Very powerful and very convenient due to the extension component that does not require bending over when cleaning the floor.

Everything my husband needed to clean the car, durability and power. The battery may be heavier but it's worth it!

It lasts for one and a half to two uses of cleaning a medium-sized house. (Three rooms)
Meaning, sweeping the hallway, corners, edges, etc. and all the rooms.

20 to 30 minutes of usage.

It recharges relatively quickly.

Excellent suction power, although quite noisy. Its weight is quite heavy due to the rechargeable battery. Cleaning is a bit difficult, especially the filter. I mainly use it for cleaning my car. Although I have had it for a short time, I am satisfied with its performance. In conclusion, it is a reliable tool that is worth its money and is highly recommended.

So, let's get to it. Definitely greater durability and longevity than lower Ah. Also, greater weight! Like with all lipos, we never let them discharge completely! Luckily, with the indicator on the battery, as soon as it reaches the last bar, it's time to charge it! The charger does what it's supposed to do... charge the battery! I don't know if it charges quickly or slowly because I have two batteries, so I don't care.

The best in vacuum cleaners! Using the handle, it has become our right hand! We haven't used a regular broom for over a month...! I highly recommend it without hesitation!

Very powerful battery in proportion to its characteristics. It also charges very quickly, so it doesn't delay you in your work.

The charger was purchased as a replacement for another one, which burned out during a power outage (due to a problem with the neutral - experts will understand). Since I have various devices from the same company (drill, vacuum cleaner, sander) that use common batteries, I bought this one, along with another one with a larger capacity! So far, everything is good. The charger does exactly what it's supposed to do, it charges, while the new larger battery simply doesn't run out. When used with the sander, I sanded an entire table measuring 1.80 * 0.90 and the charge only dropped by half! A very good purchase. I recommend it

For now, it seems very good. Powerful with long-lasting battery. I don't give it 5 stars because it's still early to evaluate its durability over time.
Update after one year: it works exceptionally well

It's fine, it withstands a lot but it's heavy, it easily tires me out :/
If I could change, I would get the smaller one.

I bought the set in order to use it for the specific company's vacuum cleaner.
The battery takes about 3 quarters to charge.
I don't know how many charging cycles its lifespan is, but the 25e battery and charger are value for money

Excellent battery with great autonomy. I use it with the TE-CD 18 drill and the GE-LX 18 pruning shears (over 500 cuts). It charges quickly and doesn't drain even if it remains unused for 3 months.

For now, it is very good. Operating time for the vacuum cleaner is 25 to 30 minutes. Weight is not something unusual. I would choose the larger battery if I wasn't afraid of its heaviness. Now that I know for sure, I will get the larger battery, which is the 5-ampere.

Initially, I ignored the fact that the battery is sold separately and I won't hide that I was disappointed by the device's [Einhell vacuum cleaner] malfunction on its own. After purchasing the battery/charger, I realized that it costed more, but it was a very good purchase! The vacuum cleaner simply rocks!

After 2 months of operation, in combination with a vacuum cleaner from the same company, we are completely satisfied.

Very good powerful with battery indication it is worth the 4 ah compared to the one with the two because it lasts longer and also the set with the charger is worth it

For the Einhell vacuum cleaner that does not come with a battery and charger, it is worth getting the 18V 4Ah battery set with charger instead of buying them separately to get a cheaper price. I recommend the 4Ah battery for better performance

Value for money. The battery I bought for the solo vacuum cleaner lasts for about half an hour of continuous use.

I bought this product because I needed a rechargeable vacuum cleaner! This specific battery is used for all the rechargeable tools of Einhell!