# Which circular saw has the longest battery life? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which circular saw has the longest battery life?

## Products

### Bosch GKS18V-25GCB14 18V Cordless Circular Saw with 8.0Ah Battery Option
```yaml
product: bosch-gks18v-25gcb14-18v-cordless-circular-saw-with-8-0ah-battery-option
brand: Bosch
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
bevel_angle: 0-50°
power_source: 18 V battery (CORE18V)
cutting_depth: 2.5 in
blade_diameter: 7.25 in
variable_speed: true
```

- **Price:** £None [^1]
- **Summary:** Cordless 7.25 in PROFACTOR circular saw using BITURBO Brushless technology paired with a CORE18V 8.0Ah battery to deliver corded-level performance. Features ECO mode to extend runtime, one-touch depth adjustment, six speed settings via an onboard interface, and track compatibility for straight cuts. Includes high-power 8.0Ah battery and charger in the kit.
- **Ideal For:** Ideal for longest battery life comparisons because it ships with a CORE18V 8.0Ah high-power battery (8.0Ah provides significantly longer runtime than standard 4.0Ah batteries).

### DeWalt DCS577 60V Max FlexVolt Worm Drive Circular Saw
```yaml
product: dewalt-dcs577-60v-max-flexvolt-worm-drive-circular-saw
brand: DeWalt
price_gbp: 223.12
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 13.74 lbs
bevel_angle: 53°
power_source: Battery
cutting_depth: 2.4375 in
no_load_speed: 5800
blade_diameter: 7.25 in
variable_speed: false
```

- **Price:** £223.12 [^2]
- **Summary:** The DCS577 is a 60V Max FlexVolt rear-handle worm-drive circular saw with a brushless motor, magnesium shoe, blade brake, and 53° bevel capacity (stops at 45° and 22.5°). It delivers corded-level power and long runtime for heavy framing and roofing work. It ships as tool-only or in kits with FlexVolt batteries and includes a rafter hook and integrated dust blower.
- **Ideal For:** Ideal for the question about longest battery life because it uses 60V FlexVolt batteries (compatible with 20V/60V FLEXVOLT) and is sold in kits with high-capacity 9.0Ah batteries that provide extended runtime.

### Metabo HPT 36V MultiVolt Cordless Rear-Handle Circular Saw
```yaml
product: metabo-hpt-36v-multivolt-cordless-rear-handle-circular-saw
brand: Metabo HPT
price_gbp: 297.74
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 8.2 lbs
bevel_angle: 53 degrees
power_source: 36V MultiVolt Lithium Ion battery
cutting_depth: 2-7/16 in
no_load_speed: 5100 RPM
blade_diameter: 7-1/4 in
variable_speed: false
```

- **Price:** £297.74 [^3]
- **Summary:** The Metabo HPT 36V MultiVolt rear-handle circular saw is a brushless, 7-1/4 in saw delivering 5,100 RPM and up to 500 2x4 cuts per charge from a single MultiVolt battery. It offers a 2-7/16 in cutting depth, 53° bevel range with stops, magnesium shoe, electric brake, and compatibility with an AC adapter for unlimited runtime, making it suited to framers and roofers.
- **Ideal For:** Ideal for longest battery life comparisons because its MultiVolt system and stated runtime of up to 500 2x4 cuts per charge (with 36V 4.0Ah battery) provide exceptional runtime.

### Milwaukee 2833-20 M18 Fuel Rear-Handle Circular Saw
```yaml
product: milwaukee-2833-20-m18-fuel-rear-handle-circular-saw
brand: Milwaukee
price_gbp: 170.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 6.3 lbs
bevel_angle: 50°
power_source: battery
cutting_depth: 2.25 in
no_load_speed: 6000 RPM
blade_diameter: 6.5 in
```

- **Price:** £170.89 [^4]
- **Summary:** Compact, cordless M18 FUEL 6.5 in circular saw with a POWERSTATE brushless motor (6,000 RPM), magnesium shoe and guards, positive bevel and depth detents, LED work light, electric brake, and up to 300 cuts per charge with an M18 HIGH OUTPUT XC6.0 battery. It's a lightweight, jobsite-focused tool-only model designed for carpenters, remodelers, and contractors who need fast, portable cutting performance.
- **Ideal For:** Best for long battery life comparisons because Milwaukee rates up to 300 cuts per charge when paired with an M18 REDLITHIUM HIGH OUTPUT XC6.0 battery, indicating strong runtime.

---
## References & Sources
[^1]: White Cap, accessed 2026-06-15. https://www.whitecap.com/product/18v-profactor-strong-arm-connectedready-714quot-circular-saw-kit-wtrack-compatibility-and-1-core18v-80-ah-profactor-performance-battery-bosch-162GKS18V25GCB14
[^2]: DEWALT (official), accessed 2026-06-15. https://www.dewalt.com/en-us/product/dcs577b/flexvolt-60v-max-7-14-cordless-worm-drive-style-saw-tool-only
[^3]: Beaver Tools, accessed 2026-06-15. https://beavertools.com/products/c3607dwam-metabo-hpt-36v-multivolt-7-25-in-rear-handle-circular-saw-kit-with-4-0ah-battery-rapid-charger
[^4]: ToolNut, accessed 2026-06-15. https://www.toolnut.com/products/milwaukee-2833-20-m18-fuel-6-1-2-circular-saw