SmarToools RB40 AA 1.5V 2600mWh Rechargeable Battery (4Pcs Set)

The smartoools rb40 rechargeable battery is a four-cell set of AA 1.5V lithium-ion batteries that you can charge again over USB, instead of buying disposable cells each time. It suits people who run AA devices at home, such as remote controls, wall clocks and torches, and who want a steady spare supply in Bangladesh.

• About the smartoools rb40 rechargeable battery
• Key features
• Specifications
• How to use / set up
• Compatibility and what is in the box
• Who should buy it in Bangladesh
• Alternatives in our store
• Warranty and support
• Delivery, returns and ordering
• Frequently asked questions

About the smartoools rb40 rechargeable battery

According to the listing, the brand is SmarToools, the model number is RB40 and the material is lithium-ion. The listing title reads SmarToools RB40 AA 1.5V 2600mWh Rechargeable Battery (4Pcs Set), and the specification block spells the brand as SMARTOOOLS. Each cell is listed with a nominal voltage of 1.5V and a capacity of 2600mWh. Together, those details point to AA-size cells for devices that need a steady supply between charges. The smartoools rb40 rechargeable battery is best judged by its size, voltage and charging method rather than by brand name alone.

If you are new to rechargeable cells, it helps to understand how a charger and a cell work together. The general background is explained in what a battery charger does, which is a useful starting point. Habits that suit any AA cell also suit the smartoools rb40 rechargeable battery. Charge with the method the listing describes, keep the contacts clean and dry, and, as general practice, avoid mixing old and new cells in one device.

For buyers in Bangladesh, the practical case is simple.

Load-shedding can interrupt evenings in many areas, and a torch or battery-powered remote is most useful at exactly those moments. A charged set of spare cells means you are not searching for disposable batteries in a dark shop. Humidity can soften loose packaging and dull metal contacts, so keep the smartoools rb40 rechargeable battery in a closed box in a dry place, away from direct sun and damp shelves.

Choosing between AA and AAA is the first decision for most buyers. The title of this listing names AA size, so check the device manual or the label inside the battery compartment before you buy. Common AA uses include remote controls, wall clocks, torches and some toys. If your equipment takes AAA cells, the smartoools rb40 rechargeable battery is not the right set, and our alternatives section lists another option.

A practical way to choose is to count your devices. Write down how many AA cells each device takes and how often you change them. Four cells suit a household with several AA items, while a smaller pack may be enough for one or two devices. Because the smartoools rb40 rechargeable battery is sold as a four-pack, it fits best where several devices share the same cell size.

Key features

The listing highlights several points about the smartoools rb40 rechargeable battery. The notes below explain each one in plain terms, using only the details the listing gives.

USB Type-C charging at 5V

According to the listing, the cells charge through a Type-C USB cable at a charging voltage of 5V. That makes a 5V USB power source with a Type-C connection the listed charging route, rather than a dedicated charger for one cell size. The listing gives a charging time of 2 hours (±0.5), so you can start a charge in the evening and expect the set to be ready after about two hours. A phone charger with a Type-C port may fit, but check that its output is 5V before you rely on it. Charging the smartoools rb40 rechargeable battery this way keeps your kit simple, because one cable and one adapter can serve several devices in the house.

Capacity: 2600mWh and typical 1733mAh

The listing gives a capacity of 2600mWh for the smartoools rb40 rechargeable battery, with a typical figure of 1733mAh. Watt-hours and milliamp-hours measure related but different things, so compare them with another brand only after checking the units. A remote control draws little power and can keep a cell going for a long time, while a torch or a toy with a motor drains it faster. The listing does not state runtimes, so treat these examples as general guidance rather than promises. Noting which devices you use most will help you judge how often this set needs charging.

LED charge indicators

According to the listing, the LED indicators blink while the cells are charging and stay on when they are fully charged. That gives you a quick visual check without opening a device or testing each cell one by one. Once the light stays on, you can unplug the source and use the set. The listing does not describe other light patterns, so do not assume meanings beyond these two states. For the smartoools rb40 rechargeable battery, that signal is the only completion cue the listing describes.

Listed protection features

The listing states YES for short-circuit, over-flowed, over-charged and over-discharged protection on the smartoools rb40 rechargeable battery. In plain terms, these are safeguards intended to reduce the risk of damage or trouble when a fault occurs. Protection features help, but they do not replace careful use. As general practice, use the cells in devices that match their size, keep the contacts clean and dry, and do not leave any charging set unattended for long periods. The listing does not describe the protection circuit in more detail, so ask us if you need that information.

Compact AA size with listed dimensions

The listing gives the diameter as min 13.7mm and max 14.5mm, and the height as min 49.5mm and max 50.5mm. The weight is listed as 18.2(±0.5)g. Because the listing gives ranges rather than one exact size, look at the battery compartment of your device first. Make sure each cell of the smartoools rb40 rechargeable battery sits snugly without being forced. A cell that rattles or needs force is a sign to stop and recheck the fit.

Specifications

The smartoools rb40 rechargeable battery is described in the product listing with the data below. Each row reproduces the listed label and value, so you can compare it with your device manual or another product page.

These are listed specifications from the product listing, not measurements we have made.

How to use / set up

Setting up the smartoools rb40 rechargeable battery takes only a few minutes. Follow the steps below, and check the listing or your device manual if anything is unclear.

1. Check that your device takes AA-size cells and look for the polarity marks inside the battery compartment.
2. Connect a Type-C USB cable to a 5V USB power source. The listing does not include a diagram of the charging connection, so check the packaging and the product before you connect.
3. Watch the LED. According to the listing, it blinks while charging and stays on when fully charged. The listed charging time is 2 hours (±0.5).
4. Unplug the source once the LED stays on, then insert the cells into your device, matching the polarity marks.
5. Store unused cells in a dry box, and remove them from devices you will not use for long periods.

Keep the four cells together so you can see at a glance which ones are charged. As general practice, do not mix these cells with disposable cells in the same device, because mixed sets can behave unevenly. As a general precaution, not a listed instruction, stop and check the source and connection if a cell feels hot during charging.

A practical routine for a busy Dhaka household is to charge the smartoools rb40 rechargeable battery during a period when you can watch the LED, using the 2-hour listed charging time as the guide. Then keep the set in a closed box near the devices you use most. That way the cells are ready when a power cut arrives, and you avoid rushing out for disposable batteries.

When you swap cells, replace the whole set of four at once where possible, so the cells stay closer in condition. Once you have the set, charge all four cells in one session, watch the LED, and label the box with the date and the words smartoools rb40 rechargeable battery, so everyone at home knows which set is charged.

If a device does not work with a freshly charged set, check the polarity and the contacts in the battery compartment first, then look at the device itself. Charge in a dry spot on a stable surface, away from water, damp walls and direct sun. In humid weather, wipe the charging port and the cell ends with a dry cloth before use, and keep the charger off the floor.

Compatibility and what is in the box

The following points are listed for the smartoools rb40 rechargeable battery:

• A 4-pcs set of cells
• AA-size dimensions as given in the specification table
• Nominal voltage 1.5V
• Type-C USB charging at a charging voltage of 5V
• Lithium-ion material

The listing does not confirm whether a Type-C cable or USB power adapter is included, and it does not confirm compatibility with any particular device. It names no compatible products, so the match has to come from your own device’s battery compartment and manual.

Before you order, make three checks. Confirm that your device takes AA size, confirm that you have a 5V USB source, and confirm that you have a Type-C cable. The listing describes charging only through Type-C at 5V, so a charger with another voltage is not the listed route for these cells.

If you already own a Type-C cable and a 5V USB adapter, you can start charging straight away. If you do not, plan to buy those items separately and check that they match the 5V charging voltage in the listing. A spare adapter kept with the set is a useful extra in a home with several charging needs.

Who should buy it in Bangladesh

Households with several AA remotes, wall clocks or kitchen gadgets are the clearest fit for the smartoools rb40 rechargeable battery. A set of four cells can replace a steady stream of disposable purchases, and the cells can be charged again whenever mains power is available.

Students and night readers who use a torch or desk lamp that takes AA cells will also find this useful. Keeping a charged set of smartoools rb40 rechargeable battery cells in a drawer means you are not hunting for batteries during an evening power cut.

Small shops and offices that use AA-powered handheld tools, scanners or timers may find the set practical, provided the device takes AA cells. Check each device’s manual first, so the full set goes only where it fits.

Home office users who keep a desk timer, a wireless mouse or a small desk light running on AA cells may appreciate a labelled set at the desk. A labelled smartoools rb40 rechargeable battery set saves time, because you spend less effort looking for a spare when a device stops mid-task.

Parents who buy toys and games that use AA cells may find a labelled set useful, although the listing does not name any toy or game. Check the battery door on each item before you charge the cells. A labelled box also makes it easier to tell charged cells from empty ones.

Buyers who need a different size should look elsewhere. Confirm your device’s size before you order. If your device takes AAA cells, the AAA option in our alternatives section is a better starting point. If you need a charger for several cells at once, the charger in that section may suit you better than a battery set alone.

Households sharing a flat often do well to keep one labelled box in a fixed place, so everyone knows where the charged cells are.

Alternatives in our store

If the smartoools rb40 rechargeable battery is not the right size or pack count for you, browse these related products. The SmarToools RB20 AA 1.5V 2600mWh Rechargeable Battery ( 2 Pcs Set) offers a smaller two-cell pack for AA devices. Compared with the smartoools rb40 rechargeable battery, it gives you fewer cells to rotate, which may suit a smaller household. For AAA devices, the SmarToools RB20 AAA 1.5V 750 mWh Rechargeable Battery (2 Pcs Set) is listed at 750 mWh, so it suits a different set of devices. For charging, the Liitokala Lii M4S 4-Slot Multifunctional Battery Charger is a different kind of product, listed as a four-slot charger. The Hoco J112 iPx Smart Li-Polymer 2716mAh iPhone X Battery is a lithium-polymer battery for an iPhone X, which is a separate job from AA cells. You can see the full range in our Batteries & Chargers category.

Warranty and support

Warranty: 7 Days seller warranty.

Delivery, returns and ordering

We deliver all over Bangladesh and you pay cash on delivery. Delivery usually takes 1–3 days inside Dhaka city and 2–5 days outside Dhaka. You can return it within 7 days of delivery (see our Delivery & Returns policy).

Questions before ordering: call 09638054751, message us on Facebook Messenger or email care@gadgetsuperb.com.

For the smartoools rb40 rechargeable battery, read the full terms on our Delivery & Returns policy page before you place your order. If you live outside Dhaka, allow the longer outside-Dhaka window when you plan a replacement, because the same cash on delivery option applies across Bangladesh.

Frequently asked questions

Is the smartoools rb40 rechargeable battery sold as a set of four cells?

Yes. The listing title describes the smartoools rb40 rechargeable battery as a 4Pcs set of AA 1.5V cells.

What size is the smartoools rb40 rechargeable battery?

The listing describes the smartoools rb40 rechargeable battery as AA size, with a diameter of min 13.7mm and max 14.5mm, and a height of min 49.5mm and max 50.5mm.

How long does the smartoools rb40 rechargeable battery take to charge?

The listing gives a charging time of 2 hours (±0.5) for the smartoools rb40 rechargeable battery when charged with a Type-C USB cable at 5V.

Can I charge the cells overnight?

The listing gives a charging time of 2 hours (±0.5). It does not address overnight charging, so unplug the source once the LED stays on.

What does the smartoools rb40 rechargeable battery charge with?

The listing gives Type-C USB cable charging at 5V for the smartoools rb40 rechargeable battery. Whether a cable or adapter is included is not confirmed by the listing.

Does this set have a warranty?

Warranty: 7 Days seller warranty.

Does the smartoools rb40 rechargeable battery have protection features?

Yes, according to the listing, the smartoools rb40 rechargeable battery states YES for short-circuit, over-flowed, over-charged and over-discharged protection.

Can I use this set in a remote control or clock?

Possibly, if the device takes AA cells. The listing does not name specific devices, so check the battery compartment of your remote or clock first.

Can I use these cells in a torch?

Possibly, if the torch takes AA cells. Check the label inside the battery compartment to see which size it needs.

Can I pay cash on delivery?

Yes. We deliver all over Bangladesh and you pay cash on delivery.

How long does delivery take?

Delivery usually takes 1–3 days inside Dhaka city and 2–5 days outside Dhaka.

Can I return the smartoools rb40 rechargeable battery?

Yes, within 7 days of delivery, as set out in our Delivery and Returns policy.