Procurement guidance

A 510 battery is a lithium cell in a standard-sized wrapper with a standard thread, used across a wide range of vaporizer hardware. The size being standardised is what makes them interchangeable, and it is also why the printed capacity is the first thing to be sceptical about.

The number on the wrapper is a claim about the cell. What determines whether your hardware performs is the cell inside it — its chemistry, its rated capacity, and its continuous discharge current. For a buyer, the practical question is not "how many milliamp hours" but "will it deliver that output under the load the device puts on it, for the length of a session". A cell that meets the first number and not the second produces a product that underperforms and generates returns.

Two other things decide compatibility before capacity matters: thread length, and whether the device expects a flat or button top. Both are cheap to specify and expensive to get wrong, because the failure is a device that does not fit rather than a device that performs badly.

For wholesale ordering, the useful specification is therefore a measured figure and a load requirement, not a printed label. We confirm both in writing before a quotation, and we tell you when a requested figure is not achievable for the price band you are asking about.

A packaging quotation is meaningless without six inputs, and the most common reason a quote is wrong is that one of them was assumed rather than asked for.

First, the unit count, because packaging is priced per unit and setup is amortised across the run. Second, the packaging layers you actually need — blister card, inner box, outer carton — since each is a separate print and material cost. Third, what is printed on each, because print setup has its own minimum independent of the product MOQ. Fourth, barcode requirements for your market. Fifth, the manual and inserts, if any. Sixth, the destination, because labelling requirements differ by jurisdiction.

The one that surprises people is the print run minimum. Branding 20,000 units may still require 50,000 printed, because the press setup is sized to the run rather than to your order. That is not a way of charging more for your branding; it is how the branding is manufactured.

A sample is cheap relative to a production run, so the value of it comes entirely from checking the right things in an order that makes a defect cheap to fix. Fit and function first, cosmetics last.

Start with fit: does it thread, seat and connect correctly, without force or modification. A sample that needed adjusting to fit will not stop needing adjusting in production. Then function: does it charge, does it discharge under load, and does anything behave differently from the specification you were given. Then packaging: is the artwork correct, is the barcode readable, does the packaging survive a drop. Then cosmetics: seams, scratches, mould marks, print quality.

Record what you checked and the result. An unchecked sample is indistinguishable from no sample at all, because when the issue appears at quantity you have no baseline to point back to.

MOQ is a consequence of setup cost spread over a run, so the way to think about it is which choices add setup. Tooling or mould work adds a fixed cost that a small order cannot absorb. A print run minimum adds setup independent of the product MOQ. New packaging format adds material and labour. A colour not in the stock range adds either a paint changeover or a new mould.

Stock colours and existing packaging formats add no setup at all, which is why they sit at the bottom of the range. The useful consequence is that if a MOQ is higher than expected, the lever is almost always packaging rather than the product.

The tempting alternative is to run standard product first and brand it later. Sometimes that is right, because it de-risks a market. But it is usually a second MOQ and a second setup, so it costs more than the single customised order would have. Worth modelling both before deciding.

Inspection is the last point at which a problem is still cheap to fix, and it only helps if the scope was agreed before production rather than after.

Agree before production what is checked, on how many units, and against what standard — particularly the cosmetic grade standard, which is meaningless in the abstract and decisive in practice. Specify what "acceptable" means for seams, scratches and print, ideally against a sample you have already approved.

Also decide who arranges it. Pre-shipment inspection coordinated through the supplier is the normal arrangement, but buyers are entirely entitled to bring their own third-party inspector, and many prefer to. Either way the result should reach you whatever it is; an inspection that only reports good news is not performing a check.

If findings appear, the remedy is for the buyer to choose under the contract terms — rework, replacement, partial shipment, or cancellation. That is why those terms are fixed at order confirmation rather than at the quote stage, when nobody yet knows what the goods look like.