Samsung Galaxy S21 5G Battery Replacement is available at Mascom International for KSh 2,900, with a brand new, original-grade 4000mAh replacement battery fitted into your own phone and the labour already included in that price. The Samsung Galaxy S21 5G Battery Replacement suits the international version of the phone, model SM-G991B, and we confirm other regional versions on WhatsApp before booking. Our technicians carry out the work at Mascom International, Old Mutual Building, First Floor Room 4, Kimathi Street, Nairobi CBD. You walk in with a tired phone and walk out with the capacity Samsung rated for this model.
Built for sales teams, journalists and university students across Kenya who still rely on this 6.2-inch phone, the Samsung Galaxy S21 5G Battery Replacement fixes the complaint we hear most about it. After a few years, the original cell drains by lunchtime, switches the phone off while charge still shows, or warms up during a simple video call. Those are signs of a worn battery, not a broken phone. A fresh cell brings back the endurance you had in the first months, so M-Pesa payments, maps and a full day of WhatsApp calls no longer depend on finding a socket.
Where many Nairobi phone stalls cannot say where a battery came from, Mascom International installs an original-grade replacement battery and puts a written 6-month warranty behind it. Customers across Nairobi tell us they had almost given up on a phone whose camera, screen and speed still served them well. The Samsung Galaxy S21 5G Battery Replacement keeps that phone working for KSh 2,900, far below the cost of a new handset. Back up your data, then bring the phone to our Kimathi Street store, or send its model number on WhatsApp first so we can confirm the Samsung Galaxy S21 5G Battery Replacement is the right match.
Common Questions About the Samsung Galaxy S21 5G Battery Replacement
How much is the Samsung Galaxy S21 5G Battery Replacement in Kenya?
The Samsung Galaxy S21 5G Battery Replacement costs KSh 2,900 at Mascom International in Nairobi CBD, and that price includes the fitting labour. You get a brand new, original-grade 4000mAh battery installed in your own phone by our technicians, plus a 6-month warranty on the replacement battery. There is no separate charge for opening the phone or for the part itself. The Samsung Galaxy S21 FE 5G takes a larger cell at the same KSh 2,900, so confirm which phone you own before visiting.
How can I tell my Samsung Galaxy S21 5G needs a new battery?
Your Samsung Galaxy S21 5G needs a new battery when it drains far faster than it used to, or shuts down while the screen still shows charge left. Other warning signs include a back panel or screen lifting away from the frame, which means the cell has swollen, and heat during light tasks like browsing. A swollen battery should be replaced promptly, so stop charging it overnight and bring the phone to Mascom International on Kimathi Street for a check.
Should I replace the Samsung Galaxy S21 5G battery or buy a new phone?
Replacing the battery is the sensible choice when your Samsung Galaxy S21 5G still has a clean screen, working cameras and the speed you need. For KSh 2,900 you restore its endurance and keep your apps, photos and settings exactly where they are. A new phone makes more sense if the screen is cracked, the charging port is failing, or you want features this 2021 model lacks. Samsung promised four major Android updates at launch, so weigh how much ongoing software support matters to you.
How does a new battery help my Samsung Galaxy S21 5G during KPLC power cuts?
A new 4000mAh battery lets your Samsung Galaxy S21 5G ride out a KPLC outage on one charge instead of dying by mid-afternoon. Worn cells struggle most when you hotspot a laptop over Safaricom or Airtel Kenya, or stream music on a long matatu ride home. A fresh battery also accepts power bank top-ups properly, since the phone supports 25W wired charging. Keep the phone off hot car dashboards, because heat ages any lithium-ion cell faster.
Will my Samsung Galaxy S21 5G stay water-resistant after the battery swap?
No, treat your Samsung Galaxy S21 5G as no longer water-resistant to its original IP68 rating once the battery has been replaced. The phone left the factory sealed to survive 1.5 metres of fresh water for 30 minutes, and opening the glass back disturbs that seal. Our technicians reassemble the phone with care, but no repair counter can restore a factory seal. Keep it away from rain, pools and wet hands during the long rains, and use a pouch at the coast.
Does wireless charging still work after the Samsung Galaxy S21 5G Battery Replacement?
Yes, wireless charging, reverse wireless sharing and 25W wired charging all keep working after the Samsung Galaxy S21 5G Battery Replacement. The phone supports 15W Qi wireless pads and 4.5W reverse wireless charging for earbuds or a watch. Those features live in the phone itself rather than the battery, so a correctly fitted original-grade cell supports them as before. Mascom International sells compatible USB-C chargers separately if your old adapter has worn out.
What should I do before bringing my Samsung Galaxy S21 5G in for a battery change?
Back up your Samsung Galaxy S21 5G to Samsung Cloud, Google Drive or a computer before you visit, since any repair carries a small risk to stored data. Remove the screen lock or share it with the technician, so the phone can be tested after fitting. Find the model number under Settings, then About phone; the international version reads SM-G991B. Send that number to +254 708 852 521 on WhatsApp, and we will confirm the match before you travel.
Who should buy the Samsung Galaxy S21 5G Battery Replacement and who should skip it?
Buy the Samsung Galaxy S21 5G Battery Replacement if your phone works well but no longer lasts a working day, or if the back panel has started lifting. It suits owners who like this compact size and would rather not move years of data to another device. Skip it if your screen is also cracked or showing lines, and ask Mascom International about its screen replacement service first. Owners of the Samsung Galaxy S21 FE 5G or Samsung Galaxy S21 Ultra need the battery made for their model instead.
Technical Specifications
Battery Cell and Capacity
- Rated 4000mAh capacity, the figure Samsung lists for this phone, so you get the full original battery size back.
- Lithium-ion chemistry, the same cell type the phone used from the factory, so its charging system recognises it normally.
- Brand new, original-grade cell that has never been fitted to another phone before it goes into yours.
- Flat shape and connector layout match the original, so the cell sits correctly inside the slim 7.9 mm body.
- Restores the endurance a worn cell has lost, so heavy days of calls, maps and video stop ending early.
Compatibility and Model Matching
- Made for the Samsung Galaxy S21 5G, the 6.2-inch model with a flat Dynamic AMOLED 2X screen and 120Hz refresh.
- Fits the international model SM-G991B and the dual-SIM SM-G991B/DS, which share the same internal layout.
- Other regional versions, including US and Korean units, are confirmed on WhatsApp before booking, so nothing is guessed.
- Not for the Samsung Galaxy S21 FE 5G, which has a larger body and takes a 4500mAh battery of its own.
- Not for the Samsung Galaxy S21 Ultra either, since that bigger phone needs a battery shaped for its own frame.
Charging Behaviour
- Works with 25W USB Power Delivery charging, the standard Samsung uses for this phone, through a compatible adapter.
- Supports 15W Qi wireless charging, so desk pads and car mounts you already own keep working after the swap.
- Keeps 4.5W reverse wireless charging, which lets the phone top up earbuds or a watch resting on its back.
- Accepts power banks with USB-C Power Delivery output, a practical backup for long days away from wall sockets.
- Samsung battery protection settings stay available, letting you limit charging levels to slow wear over the months.
Phone Hardware That Draws on the Cell
- Exynos 2100 chip built on a 5 nm process, which uses power efficiently during browsing, calls and messaging.
- 6.2-inch 120Hz screen reaching 1300 nits peak brightness, one of the biggest drains on any battery outdoors.
- 5G radio support, which pulls more power on weak signal, so a healthy cell matters on long trips.
- Android with One UI and adaptive battery tools that learn which apps you use and restrict the rest.
- Slim 169 g body, so the replacement keeps the phone as light and pocketable as it was before.
Fitting Service at Our CBD Workshop
- Labour included in the KSh 2,900 price, with no extra fee for opening, fitting or closing the phone.
- Fitted by Mascom International technicians at our Kimathi Street store, so your phone never leaves our premises.
- Your photos, apps and accounts stay on the phone, because the swap touches the battery and not the storage.
- Bring the phone in person and see it power on and charge at the counter before you leave.
- Walk-in service Monday through Saturday, with an optional WhatsApp model check beforehand to save you a wasted trip.
Safety and Quality Checks
- The worn or swollen original cell is removed with care, avoiding punctures that can cause heat or smoke.
- The new battery is checked for correct charging before the phone is handed back to you.
- Cameras, speakers, buttons and screen are tested after reassembly, so any problem shows up at the counter.
- Opening the phone disturbs the factory IP68 seal, so treat it as no longer water-resistant to that rating.
- Covered by a 6-month warranty on manufacturing defects in the replacement battery, handled at our Nairobi CBD service desk.
Package Contents
The Samsung Galaxy S21 5G Battery Replacement covers one brand new, original-grade 4000mAh replacement battery, installed into your own phone by Mascom International technicians. The fitting labour is included in the KSh 2,900 price. No charger, cable or retail box comes with the service, since the battery goes straight into your handset. If your adapter or USB-C cable has worn out, compatible chargers are sold separately at Mascom International, and our staff can test one with your phone at the counter.
Warranty
Mascom International backs the Samsung Galaxy S21 5G Battery Replacement with a 6-month warranty covering manufacturing defects in the replacement battery under normal use. Keep your receipt, and bring the phone to our Nairobi CBD service desk on Kimathi Street if you need to make a claim.
Where to Buy the Samsung Galaxy S21 5G Battery Replacement in Kenya
The Samsung Galaxy S21 5G Battery Replacement is carried out at Mascom International, Old Mutual Building, First Floor Room 4, Kimathi Street, Nairobi CBD. We are open Monday through Saturday, 9:00 AM to 7:00 PM, and you are welcome to watch the phone power on and charge at the counter before you pay. The service fits every finish of the phone, whether Phantom Gray, Phantom White, Phantom Violet or Phantom Pink.
Reach our team before your visit:
- Phone/WhatsApp: +254 708 852 521
- Email: info@mascomintl.com
- Website: www.mascomintl.com
For chargers and accessories ordered with the service, Mascom International delivers pay-on-arrival to all 47 counties, with same-day delivery across Nairobi and its environs and next-business-day delivery to Mombasa, Kisumu, Nakuru, Eldoret and other major towns. Mandera, Wajir, Marsabit, Lamu, Tana River, and Turkana receive delivery within 2-3 business days.
Every fitted battery is backed by the 6-month warranty above. We describe each part honestly, quote one clear price, and stay available for after-sales help long after your phone leaves our store.
