What Are Custom Battery Packs at Batteries Inc and What Are They Used For?

Custom battery packs at Batteries Inc are battery assemblies built to match a specific device's requirements — cell type, voltage, capacity, terminal style, and physical shape — rather than a standard off-the-shelf cell. You'd look for one when a device needs a battery that doesn't exist as a standard size, when you need a specific voltage/connector combination, or when you're replacing a pack that was designed for one product. Batteries Inc sells these alongside standard branded batteries (Duracell, Energizer, Power-Sonic, Omni-Cel, Rayovac) and wholesale/bulk options, so the custom pack is one part of a broader catalog rather than a separate service.

What "custom" actually means here

A custom battery pack is defined by the device it powers, not by the brand of the cells inside. The variables that get specified are:

• Cell type and chemistry — e.g., alkaline AA cells, lithium cells, or sealed lead acid (SLA) blocks
• Voltage — determined by how many cells are wired in series
• Capacity — determined by cell size and how many are wired in parallel
• Terminals and connectors — the physical interface to the device (U terminals, nut-and-bolt, F2, wire leads, etc.)
• Physical form — the pack's dimensions and mounting shape, so it fits the compartment

A useful example from the site's own catalog: the DL-40 Door Lock Battery Pack, 6V Alkaline, described as "Assembled w/ Duracell AA Coppertop." That's a custom pack in the plainest sense — four AA alkaline cells assembled into a 6V pack shaped and terminated for a specific door lock, using a named brand of cell inside. It isn't a standard battery you'd buy loose; it exists because that lock needs 6V in a particular form factor.

What they're used for

Custom packs show up wherever a device's power requirement doesn't line up with a standard cell:

• Access control and door locks — the DL-40 example above; locks often need a specific voltage and a pack that fits inside the lock body or a small compartment
• Security and alarm systems — panels and sensors that need a defined voltage and a connector that plugs into a board
• Backup and standby power — SLA packs used in UPS-style or emergency lighting roles, where a specific amp-hour rating and terminal type matter
• Industrial and OEM equipment — devices built around a pack spec rather than a consumer battery size
• Replacement packs for discontinued devices — when the original pack is no longer sold, a custom assembly restores the device

The common thread: the device dictates the spec, and the pack is built to that spec.

Custom packs vs. standard batteries

The practical difference is that a standard battery is interchangeable across many devices, while a custom pack is usually tied to one.

What to confirm before buying

Because a custom pack is device-specific, the compatibility check happens before purchase, not after. Confirm:

1. Voltage — match the device's requirement exactly; a 6V lock needs a 6V pack, not a 9V one.
2. Capacity (Ah/mAh) — for SLA packs especially, the amp-hour rating determines runtime. The site lists SLA options across a wide range, from 12V 12AH up to 12V 100AH, so the rating is a real selection variable, not a formality.
3. Terminal type — U terminals, nut-and-bolt (NB), F2, or wire leads. A pack with the right voltage but the wrong terminal won't connect. The catalog distinguishes these explicitly (e.g., "PS121000, U Terminals" vs. "PS12350, NB Sealed Lead Acid").
4. Physical dimensions — measure the compartment; a pack that fits electrically but not physically is unusable.
5. Chemistry — alkaline, lithium, and sealed lead acid behave differently in temperature range, rechargeability, and disposal. SLA packs are rechargeable; the alkaline DL-40 pack is not.

If you're replacing an existing pack, the old pack's label usually carries voltage, capacity, and sometimes a part number — that's the fastest route to a match.

Where custom packs sit in the wider catalog

Batteries Inc positions itself as a source for wholesale, bulk, and custom battery packs, with free shipping noted on the site. The catalog mixes:

• Branded standard cells in bulk boxes — e.g., Duracell Procell Intense CR123 (12 per box), Duracell Procell PCCR2 lithium (12 per box), 9V Duracell PC1604 Procell (12 per box), Energizer Industrial EN22 9V (box of 12), AAA Duracell PC2400 Procell (box of 24)
• Sealed lead acid packs in a range of capacities and terminal types — Power-Sonic PS121000 (12V 100AH, U terminals), PS12550 (12V 55AH, U terminals), PS12350 (12V 35AH, NB), PS12280 (12V 28AH, NB), PS12260NB (12V 26AH, NB), PS12180 (12V 18AH, F2 or NB), PS12120F2 (12V 12AH, F2)
• Assembled custom packs — like the DL-40 door lock pack

Prices shown on the site are sale prices with original prices struck through (for example, the DL-40 lists at $7.95 reduced to $4.85; the PS121000 at $328.90 reduced to $262.90). Treat listed prices as current-at-listing, not permanent.

The short version

A custom battery pack is a battery built to a device's spec — voltage, capacity, terminal, and shape — instead of a standard cell size. At Batteries Inc they're sold alongside bulk branded batteries and SLA packs, and the clearest example in the catalog is the 6V DL-40 door lock pack assembled from Duracell AA cells. Buy one when your device needs a voltage/terminal/form combination that no standard battery provides, and confirm voltage, capacity, terminal type, and physical dimensions against the device before ordering.