Start from the laptop variant
A replacement laptop battery is bought to replace the original battery in a laptop, and the laptop variant determines which batteries can serve it. Two laptops that look the same can take different batteries, because their internal layouts, connectors, and electrical requirements differ, even when their outward appearance is nearly identical. A buyer who orders by appearance alone risks a battery that cannot be fitted, or that fits but does not match electrically.
The variant is identified by its model number and any further identifiers the laptop carries, such as a serial or configuration code. Name the exact variant in the inquiry, so the seller can check it against the battery's specification, rather than guessing from a description. A seller who is given only a brand or a screen size cannot confirm compatibility, and a buyer who accepts a battery on that basis is taking a risk that could have been avoided.
Check voltage before capacity
Voltage must match the laptop's requirements, because a battery with the wrong voltage will not serve the laptop, however well it fits physically. A laptop battery's voltage is stated on its model page, and it should be compared with the original battery's voltage and with the laptop's requirements, not assumed from the battery's size or shape. A battery that looks the same but has a different voltage is a different battery, and it should not be used.
Capacity describes how much energy a battery holds, and it is often the first figure a buyer looks at, but it should not be the first figure checked. A larger capacity does not mean a better battery for a given laptop, because the battery must first fit and match electrically, and a larger battery may not fit the laptop's battery bay. Check voltage and fit first, then compare capacity among the batteries that match.
Fit, connectors, and shape
Fit describes the battery's physical shape, its connectors, and its mounting, and it must match the laptop's battery bay exactly. A battery that is a few millimetres too large will not fit, and a battery with the wrong connector cannot be connected, however well its voltage and capacity match. The model pages give the specification figures, but fit is best confirmed by naming the exact variant in the inquiry, so the seller can check it.
Connectors differ between laptop kinds and even between variants of the same kind, and a connector that looks similar may not be the same. Do not assume a connector matches because it looks similar, and do not force a connector that does not fit easily: forcing a connector can damage the laptop or the battery, and a damaged battery should not be used.
Capacity and weight together
Capacity and weight together describe a battery's size class: a larger capacity in a heavier unit suits a laptop that needs long running time and can carry the weight, while a lighter laptop may need a smaller battery. The laptop models on this site range from 253g to 480g, with capacities from 4600mAh to 8700mAh, and that range shows how much batteries differ even within one category.
A buyer who carries a laptop all day should weigh the running time against the weight, because a heavier battery adds to the load on every journey. A buyer who uses a laptop mostly at a desk may prefer a larger capacity, because weight matters less. The choice is personal, but it should be made among batteries that match the variant, not among all batteries.
Chemistry: Li-polymer and Li-ion
Laptop batteries use Li-polymer or Li-ion chemistry, and the chemistry is stated on each model page. Li-polymer batteries use a polymer electrolyte, and they can be made in thinner shapes, which suits slim laptops; Li-ion batteries use a liquid electrolyte, and they are common in many devices. The chemistry alone does not decide which battery is better, because the laptop variant determines which chemistry it can use.
A buyer should not choose a battery by chemistry alone, and should not assume a Li-polymer battery can replace a Li-ion battery or the reverse, unless the model page lists it for that variant. The model pages state the chemistry for each model, and the inquiry is the place to confirm that the chemistry matches the variant.
How to read a specification table
A specification table lists the figures a model page states for that model: chemistry, voltage, capacity, energy where stated, weight, and any further figures the official page states. Read the table as a whole, not as a single figure, because a battery is described by all its figures together. A table that states only voltage and capacity is incomplete for a decision, and the missing figures should be asked for in the inquiry.
Units matter when reading a table: voltage in volts, capacity in milliampere-hours, energy in watt-hours, and weight in grams. A figure without its unit cannot be compared, and a figure with the wrong unit cannot be trusted. This site keeps the units exactly as stated on the official pages, including figures where the original unit deserves care, and a buyer who is unsure about a unit should ask.
Bulk orders and variant checking
A buyer who orders in bulk should confirm compatibility for every variant in the bulk order, not just for one variant, because variants differ within a product line and a battery that serves one variant may not serve another. A bulk order that assumes one battery serves all variants risks a large number of unusable batteries, and the cost of returning them may exceed the saving from bulk ordering.
Name every variant in the inquiry, with the quantity for each, so the quotation can be accurate and the compatibility check can cover all of them. A seller who is given the full variant list can check each one, and a buyer who receives a quotation for the full list can order with confidence, rather than discovering a mismatch after delivery.
Before you order: a checklist
Name the model, the exact laptop variant it must serve, the quantity you have in mind, and the market you sell into, in the inquiry. Ask for the specification for the exact model, the minimum order quantity, the lead time with its meaning, the warranty terms, and the certificates that apply to your market, by name, with documents attached. Do not pay before these have been confirmed for the exact models in the order.
A checklist is not a formality: it is the buyer's protection against a mismatched battery, a missing certificate, or a misunderstood term. A seller who answers the checklist fully is a seller who has checked the order, and a buyer who asks the checklist has done the work that prevents a costly mistake. The inquiry page explains how to write the inquiry, step by step.
A note on sources and confirmation
The model specifications and compatibility statements referred to in this article come from the company profile's official product pages, as presented on this site's model and category pages. Compatibility statements are the company profile's own statements, quoted with attribution, and they are not statements by the equipment makers, nor do they imply authorisation, endorsement, or original manufacture. A specification stated for one model is not carried to another model, and a figure stated for one model should not be assumed for any other.
Figures that are not stated on a model page — a price, a minimum order quantity, a lead time, a warranty period, or a certificate for a specific model and market — are confirmed per order in the inquiry, and this article does not invent them. A buyer who needs any of those should ask for it by name, for the exact model and the exact equipment variant it must serve, with documents attached where documents are what is needed, so the answer is specific rather than general.
Before ordering, name the model, the exact equipment variant it must serve, the quantity you have in mind, and the market you sell into, in the inquiry. Ask for the specification for the exact model, the minimum order quantity, the lead time with its meaning, the warranty terms, and the certificates that apply to your market, by name, with documents attached. Do not pay before these have been confirmed for the exact models in the order, because payment removes the leverage to resolve an unconfirmed item, and a confirmed order is the only basis for a safe purchase.