CS03XL Battery for HP Elitebook 745 755 840 848 850 G3 G4 ZBook 15u G3 G4 Laptop

Description

1. What it is

The CS03XL is a lithium-ion (Li-ion) battery pack designed as a direct replacement (or compatible aftermarket option) for certain models of HP laptops—especially within the EliteBook and ZBook lines. It’s meant to restore portable power to a laptop whose original battery has aged, lost capacity, or failed. For example, marketing specs show things like 46 Wh capacity at roughly 11.4 V nominal voltage. Amazon+2Laptop Battery Express+2

2. Compatibility & fitment

This battery is built to replace specific battery part-numbers in HP laptops. Some of the compatible models include:

• HP EliteBook 745 G3 / G4

• HP EliteBook 755 G3 / G4

• HP EliteBook 840 G3 / G4

• HP EliteBook 850 G3 / G4

• HP ZBook 15u G3 / G4 mobile workstation. Manuals++2Laptop Battery Express+2

Compatible part-numbers listed for CS03XL include: 800231-141, 800513-001, HSTNN-I33C-4, HSTNN-IB6Y, etc. Amazon+1

Important: Even within a given model line (e.g., the “840” series) there may be different generations (G2, G3, G4) or sub-variants. Always check your exact existing battery’s part-number, voltage, cell count, and dimensions to be sure this battery matches. One source notes: “HP also has these same model names that are G1, G2. These are different laptops and use different batteries.” Laptop Battery Express

3. Technical specifications

Here are typical specs of the CS03XL (may vary slightly depending on manufacturer or third‐party version):

• Nominal voltage: ~11.1 V or ~11.4 V. Many replacement listings say 11.4 V. Amazon+1

• Capacity: ~46 Wh (watt‐hours) according to multiple sources. Laptop Battery Express+1

• Cell configuration: Often 3 or 4 cell (depending on design) lithium-ion pack. Lapalfa+1

• Construction: High-grade Li-ion cells (in third‐party replacements: “Class A+ Li-ion cells … from famous manufacturers such as Samsung, Panasonic and LG”). UAEBattery

• Safety/protection features (in many replacements): Over-charge protection, over-discharge protection, over-current protection, short-circuit protection, cell balancing, thermal protection. Amazon+1

4. Performance & user experience

• Runtime: A new CS03XL battery at ~46 Wh should deliver a few hours of usage depending on what you’re doing (light tasks = longer, heavy tasks = shorter). One replacement seller reports “you can expect about 2 hours to 4 hours of run time with this HP CS03XL battery when new, depending on your energy use.” Laptop Battery Express

• Lifespan: Like all Li-ion batteries, its usable life (in terms of charge/discharge cycles) decays slowly. Many third-party versions claim 300-500 full cycles, or more. Example: “useful life: 300-500 charges” for one version. Laptop Battery Express

• Quality factors: Since many of the “CS03XL” batteries on market are aftermarket or compatible replacements (not necessarily HP-OEM), variation in build quality, cell brand/source, and protection circuitry can impact reliability.

• Installation: Should be straightforward if laptop supports removable battery or easy internal access (depending on model). Always power down, disconnect AC, remove the old battery (if external), or follow service manual if internal-mount, then install the new pack, secure connectors, and boot up. One user manual includes recommended initial calibration steps. Manuals+

5. Care, safety & best practices

To get the most out of your CS03XL battery, consider these best practices:

• Avoid exposing to high temperatures (e.g., leaving laptop in hot car). Heat accelerates battery degradation. Manuals+

• Avoid letting the battery discharge completely to 0% frequently; try to keep it above ~20 % where practical. UAEBattery+1

• If the laptop is frequently plugged in and you rarely use battery power, consider removing the battery if design allows — or at least occasionally discharge/charge so that battery stays active. Some sources note: “If you frequently use an external power supply, please keep the battery disconnected from the external power supply several times a month…” UAEBattery

• Ensure firmware/BIOS of your laptop are up to date — power management improvements can help battery performance and longevity.

• For safest operation, use the original HP charger or one that meets HP’s required specs.

• When buying a replacement CS03XL, check for authenticity: correct part-number, proper voltage, alignment of mounting holes/connector, label with HP part numbers or trusted third-party brand, warranty support, good feedback. Because mismatched or low-quality batteries can lead to poor performance, overheating, or even safety issues.

6. When you might choose this

• Your original laptop battery is failing: e.g., holds only 30 – 50 % of original runtime, or shows “plugged in, not charging”, or the battery no longer accepts charge.

• You’re using one of the compatible HP models listed above and you need a direct fit replacement.

• You prefer a moderately priced aftermarket replacement rather than sourcing an OEM HP battery (which may cost more and be harder to find).

• You are comfortable verifying compatibility (voltage, capacity, physical fit) and can install the battery safely (or have someone do it).

7. Things to watch/limitations

• Because some CS03XL batteries on the market are not genuine HP originals, performance (runtime & longevity) may vary: capacity may be slightly less than spec, or protective circuitry may be cheaper grade.

• If your laptop model has a slightly different battery variant (for example different cell count or voltage) then CS03XL may not fit or may not be recognised correctly by the system. Always compare the part-number on your existing battery.

• Even a new battery will degrade over time — the “46 Wh when new” will gradually drop to maybe ~80% after a year or more depending on usage patterns.

• If your laptop is very old (e.g., more than 5-6 years) and you’re using high-intensity tasks (video editing, virtualization, lots of streaming), even a “good” battery may not restore “new laptop” runtime. Expect moderate realistic results.

• Installation by non-specialists may void warranty (if still under warranty) or introduce risk (damage to laptop interior). Carefulness is required.

8. Summary in simple terms

The CS03XL is a solid, compatible replacement battery for select HP EliteBook and ZBook laptops. It offers around ~46 Wh of capacity, uses modern lithium-ion cells, and delivers a few hours of portable runtime. If your existing battery on one of the compatible models is worn out, choosing the CS03XL (provided you verify compatibility) will likely restore your laptop’s mobility and remove the need to keep it permanently plugged in.