807956-001 Battery for HP HS04 HS03 807957-001 250 255 G5 | Fits 807612-421 HSTNN-LB6U 15-AY039WM 15-AY009DX 17-X061NR 15-BA009DX 15-AY041WM – 4 cells 2600mAh 14.8V 12-month warranty

Update: After ordering a battery from a different manufacturer and taking a closer look at that battery and my laptop's (dead) original battery, I'm revising my review. I determined that the awkward or at least imperfect fit of the battery is the fault of HP and not replacement batteries. On HP laptops I've had in the past, the batteries snapped much more smoothly into place and simply fit better. I chalk it up to, you guessed it, the constant drive to reduce costs and shorten product life cycles. My laptop is also much more difficult to repair or upgrade than previous models (it would be nice to install an SSD, but I'd probably damage the computer in the process). In any case, the HP mechanism that supposedly locks the battery in place simply feels cheap, so I urge you to be careful when installing and removing these batteries. Also, you may want to be more careful about how you store these batteries. I will write more on these topics below, but first I'll confirm that this battery does work as a replacement battery for the HP laptop model 15-ay091ms. I don't think this model is mentioned specifically in the product listing, but its original battery is labeled "replace with HP spare 087956-001", and I think it's safe to assume that this NinjaBatt battery will work with any laptop whose original battery has this label. Now, more about attaching and removing these batteries: When you flip the closed laptop upside down with the battery towards the back of the laptop (positioned as in my first photo), you will see two latches--a lock latch on the left and a release latch on the right. I have found that the lock latch doesn't really seem to engage with the battery, so that's where the fit is somewhat awkward, at least on my laptop. When a battery is properly installed, both latches are positioned inward in relation to the center of the battery. To remove a battery, slide the lock latch outward (to the left) and then slide the release latch to the right. The battery should pop out easily. When installing a battery, slide the right-hand side in first. It should engage readily with the release latch. Then slide the left-hand side of the battery in and move the lock latch to the inner position to (supposedly) lock the battery in place. All of this may seem obvious, but I'm writing this because HP's user guides seem to cover more different models than ever before, and their battery instructions within these guides seem to show even more models, some of which aren't even models supposedly covered by the guides. If you're not careful you might break the locking or releasing mechanism by following the instructions for the wrong battery. Also, with this model battery it might be easy to assume that both of the latches function in the same way, when they do not. About storing laptop batteries: When I bought my older HP laptops, HP's recommendation was to leave batteries with a 50% charge when storing them unused for a month or longer. I incorrectly assumed that this was still the case. I stored my computer for several months with the battery charged to about 50%. When I took the computer out of storage, I found that the battery was completely unusable. Before the computer even booted up I got a BIOS error message saying that it had detected a battery that was unable to accept a charge. No matter how long I left it connected to power, it indeed would not accept any charge. When I looked at HP's battery recommendations (under "how to" on their support page for my laptop model), I found that their current recommendation is to charge or discharge batteries to 80-90% before storing them, and to check them at least once every three months. They even mention using the BIOS to put batteries in "ship mode" before storing them for long periods. "Ship mode" apparently only applies to business model laptops, which suggests that users--especially of consumer models--now have to be much more careful with their batteries. This is disappointing and a definite notch against HP in my book at a time when manufacturers should be focusing more on environmental sustainability. I was pretty disappointed to find that my original battery was dead after hardly having been used at all, since I had bought my laptop at an irresistible sale price but didn't really need to use it for several months after setting it up and making sure that both the computer and the battery worked as they should. Note that the NinjaBatt Pro instructions that come with this battery say "If you are not going to use your laptop for a long time, discharge or charge the battery to 50% and store it in a cool place." This implies that the replacement battery has different storage recommendations from HP's. In any case, from now on I am going to be more careful about storing lithium batteries. Also, HP instructions in the past have recommended that users calibrate their batteries by completely discharging them. The NinjaBatt instructions say "Do not completely discharge a lithium-ion battery and then recharge it to somehow reboot or calibrate it - this is a destructive practice that's very hard on your battery. Instead, let your battery discharge (without bottoming it) to 20% and then charge it again." Based on my experience, I will go with this recommendation. Thank you to the manufacturer for responding to my original review (below). I appreciate your offer to send me a replacement battery, but that will not be necessary. I hope someone finds these comments helpful at some point. ********************************************* I bought a NinjaBatt battery in 2017 and had no issues, so I didn't hesitate to buy their "Pro" battery this time. The battery seems to work, but I have two complaints about it. First, it doesn't fit properly. When holding my computer upside-down with the battery towards the back, the battery does not engage with the retaining mechanism as it should on the left-hand side. Also, the battery is not quite flush with the bottom of the computer when installed; the size is slightly wrong. Second, the battery's bar code sticker has been placed so that it is prominently visible on the top of the battery. This battery is designed in such a way that it is incorporated as a visible bar on the main body of the computer just in front of the screen, which means that the barcode sticker is the first thing I see whenever I look at my computer. It looks terrible. I don't know if it is easily removable, but I don't want to void my warranty by taking it off. I will probably return this battery. I would also like to note that I would NOT recommend that anyone buy a replacement battery directly from HP. HP's prices are extremely high, and the original battery that came with my computer did not last. I left it unused and disconnected from a power source for longer than I should have, but even under those conditions it should not have become completely unable to accept a charge as quickly as it did. I have never had that happen with any other battery, and it made me wonder if HP is now using low-quality batteries or batteries deliberately designed for more frequent replacement. That's just my experience; I have no axe to grind against HP (or NinjaBatt).

For my HP's 240/245 G5, that HS04 batteries were amazing purchases. It fits perfectly and include same tech specs as advised the seller. May people don't read the instructions, but this manufacturer tell us you could gain best performance if you follow those instructions. It consists basically in charge your battery at least for 5 first times in 10% to grow up best performance. I proved that task and really works. Now, the NinjaBat Pro battery can run about between 6-7 hours with high loads like simulation, play or editing videos, programming, browsing, making offices docs, etc. Really it works amazing and you can enjoy it without worries. Highly recommended to you if you uses laptops everyday at least more than 10 hours per day. Reasonable price because it isn't just any battery on market, it has really nice performance to consider it to buy.

This battery gave new life to my 2016 HP laptop—$30 saved me from having to buy a whole new machine! While desktops may offer better performance depending on your needs, having a low-powered laptop is invaluable, especially for working with equipment that isn’t conveniently located near a desktop. Be sure to follow the break-in instructions carefully. To achieve full capacity, you’ll need to run the battery down to 0% five times. Once conditioned, it delivers an impressive 8 hours of battery life with average use. The battery itself is nearly identical to the original HP part it replaced, but at roughly half the price (especially since OEM HP batteries have been discontinued). It fits perfectly, meets or exceeds the original specifications, and has shown no signs of abnormal heat. If anything changes, I’ll update my review. Packaging was also excellent—the battery arrived securely in an air-cradle wrap, ensuring safe transit. If you're looking for a reliable replacement, this battery is a perfect fit for the specified model numbers.

It does for my laptop perfectly. But the warranty is only for 1 year which is too expensive at this point

Amazing to have a battery 🔋 that works. The installation was easy and I followed the instructions about how to charge it and allow it deplete to 10% and then again to 100%. The battery is working perfectly now and I’m to run my laptop for 9 hours to 20% without having to recharge.

Bought this battery as a replacement for an older laptop. The first one went out with the first month, contacted the manufacturer, they sent me another one right away. The new one has had no issues.

This Dell compatible replacement battery works well.

I ordered this battery because my husband's battery on his one year old laptop died. Seemed too soon to me to have to replace the battery on this computer that starts with an H and ends with a P. Anyways, I did not want to buy the same company's battery due to this so I searched and found NinjaBatt Pro and thought I'd give them a try and get the Pro series as it was just a little more. I received an placed it as soon as it got here and it powered the computer right up and that was totally the issue, the battery. It was a nice fit and we are happy with the battery. NinjaBatt went once stop further and sent tips on charging and care for the battery (which I like very much!) and a letter from the owner which was very nice also. A lot of companies take forgranted their customers and it seems like this company is way different than that! :) Happy battery purchaser. Thanks NinjaBatt (and Erika/owner for the tips and emailed thank you letter, a nice touch).

Fait le job. S’adapte parfaitement.

I could not follow the stated procedure for first use of the battery, because the battery did not have enough charge, but it still works, so I am not complaining too much. Otherwise, I would have given 5 stars.

Had snel een vervangende accu nodig, deze werd overnight geleverd. Tijd zal leren hoe hij blijft werken. Maar heb er een goed gevoel over.

I've had a HP laptop for a few years and the battery was starting to fail; it wouldn't charge to 100%, and the laptop would just shut off even when Windows reported a charge of around 23%. So I took to Amazon to look for a replacement. Granted, the NinjaBatt is not the cheapest on offer, but it's less than half the price of an 'original' HP replacement, and - so far, at least - seems to last longer. True, it's been a few years since the laptop was new so I could be misremembering, but I'm pretty sure that this battery is lasting longer than the original did when it was new. The other night I was using the laptop on battery for 5 or 6 hours in total, and when I was done the battery was only down to around 60%; with the original battery, I'm sure constant use would only see around 8 hours of battery life. I've been using it for a just under a week now, and it's had a few charges and seems to be working just fine. So, so far so good. I'll update the review if I should run into any issues further down the line.

Really fast delivery, well packaged and protected. Perfect fit, looks almost identical to the HP original. At first install without the charging cable, nothing happened, laptop wouldn't turn on. I then plugged my laptop in and turned it on. Once it was on and booted up, I unpluged the charger and the laptop recognized the battery and everything was fine. It arrived with over 75% charge, instructions recommended to let it run down to 10% before first charge. I did that, then charged it fully and everything is working perfectly and it's holding strong. I'm happy with it.