For equipment like a breathalyzer that is taken out and used at set times on site, losing power makes testing itself hard to carry out. A replaceable-battery type switches power using designated batteries prepared in advance, while a rechargeable type is used again after supplying power to the unit or a designated charging accessory. The difference between the two is not simply the run time per use, but who has to prepare what before and after use.
Purchasing staff tend to compare only the unit price and the run time on the spec sheet, but on actual sites the choice is shaped by where the equipment is used, how often it moves, when it can be charged, and where spare power accessories can be stored. So rather than choosing replaceable or rechargeable by which one is better, compare them by whether the work of preparing power can fit into the site's workflow.
First map where the device is used and how it moves
If the device stays in one place and is used at set times every day, you can consider charging space and access to power. The key is whether a flow is workable in which the device is charged with the designated charging accessory while not in use and its charge is checked before the next use. Even if there is an outlet for charging, if the devices are scattered across locations or their storage location keeps changing, the preparation work for this approach can become complicated.
Conversely, where devices move often, such as in vehicles, temporary work areas, or multiple entry points, first consider whether charging is possible on site. The replaceable type needs a flow of securing, carrying, and storing spare batteries instead of a charging location. In other words, a mobile site does not automatically suit the replaceable type; the criterion is whether someone is available to prepare the right number of designated batteries and keep used ones separate.
Compare the preparation work each power type leaves
| Condition to compare | What to look at for replaceable batteries | What to look at for rechargeable |
|---|---|---|
| Preparation before use | Designated batteries to bring with the device, number of spares | Whether charging is complete, connection to the designated charging accessory |
| Place of use | How to keep spare batteries safely and tell them apart | Access to power and storage space for charging |
| Moving the device | Whether batteries in use and spares can be carried together | Time to charge before moving and where to charge after returning |
| Running several units | Battery stock for each device and how it is distributed | Space to charge at the same time and charging order |
As the table shows, the challenge for the replaceable type is stock and sorting, while the challenge for the rechargeable type is time and place. For example, if one person prepares several devices before the shift starts, the rechargeable type needs a procedure for gathering the devices at the charging location the day before. The replaceable type needs a procedure for checking that designated batteries and spares for each device are prepared in the right quantities.
A "designated" power accessory here means a battery or charging accessory the manufacturer specifies for use with that model. You cannot decide to use another product's battery or charger just because its shape or terminals look similar. Check separately, in the candidate model's official documents and the quoted configuration, what is included with the unit, what is purchased separately, and which power accessories are compatible, so the scope of comparison does not shift.
Find gaps in the schedule with a hypothetical site case
For example, consider a hypothetical case in which breathalyzers are used across two work zones and the devices are gathered in an office storage cabinet after work. The first thing to observe is not the actual usage time in each zone but when the devices return to the cabinet, whether power is available near the cabinet, and the route of the person who takes the devices out the next day. These records become the basis for judging whether there is enough charging time with a rechargeable type.
If time to charge before the next use and a place for the designated charging accessory are confirmed at the cabinet, a possible action is to set an order in which devices are placed in the charging position when returned and their status is checked before they are taken out the next day. Conversely, if devices do not come back to the cabinet or the time available to connect them to power before the next use is uncertain, it is more realistic to also compare replaceable-type candidates with a configuration of designated spare batteries. The completion criterion in this case is not that one type wins, but that you can explain, along with who does what, how the needed power is ready at each actual time of use.
In this process, if the manufacturer gives a run time or number of uses, read the conditions it applies to separately. Figures from tests or specific usage conditions must not be turned into a guaranteed run time on site. A short demo lets you see the flow through charging, replacing, and checking results, but it does not verify long-term run time, so it is good to write down separately the actions confirmed in the demo and the conditions in the product documents.
In the quote, list components outside the unit by the same standard
Comparing power types does not end with the price of one unit. For a replaceable-type quote, confirm which designated batteries, spare configuration, and storage items are needed; for a rechargeable-type quote, confirm the designated charging accessory, charging space for several units, and the scope of any additional components if needed. If it is unclear whether something is included, it is better to identify it by item name rather than assume accessories visible in a photo are part of the standard configuration.
If you are introducing several units, list the number of devices and the number of power accessories separately. For example, if devices are stored separately by department, the charging setup in one place does not take care of other departments' devices. The same goes for the replaceable type: whether one department's spare battery stock can be used right away at another location depends on storage locations and movement routes.
Match the final conditions with the candidate models' documents
DATECH's official Downloads center posts product-specific materials, and the list includes Korean-language manuals for The New AF-50 and the AF-50AD. However, guidance for one model in the Downloads section cannot be used as evidence for another candidate model's power type or components. For each model being compared, check whether there is the latest official guidance for that model and whether the power accessory information matches the items actually quoted.
In the purchase request, it is useful to state the place of use, the times of day the device will be used, whether it will move, the number of devices, and where charging is possible or where spare batteries will be stored. With this information, you can spot power accessories missing from the supply configuration or preparation methods that don't suit the site. At delivery, compare the battery and charging items ordered with the components actually received, and also pass the model name and power accessory information to the department that will manage the devices, so the work of replacing and charging does not fall between the cracks.
In the end, a site where a place and time to charge are reliably available should look concretely at the rechargeable type's preparation flow, and a site that must secure power while on the move should look concretely at the replaceable type's spare-battery flow. Either way, the key is not a single run-time number, but whether the actions to prepare power and the needed components stay unbroken until the next test on site.
