Cordless Tools 18V vs 36V — Lithium Platforms BOSCH / MAKITA / MILWAUKEE

Thai tradespeople in 2026 have three main tiers of battery platform to choose from — 18V (Bosch Professional 18V / Makita LXT / Milwaukee M18) covering 95% of work, 36V (Bosch Bitturbo / Makita XGT / Milwaukee MX FUEL) for heavy work, and 12V for fine furniture work. The question everyone asks before buying a new tool: which platform to lock into, what battery size to invest in, and whether brushless is necessary. This article answers all of them with tables and real numbers.

The 3 Main Platforms of Each Brand

All 3 brands design so that:

• 18V platform = drill, impact driver, circular saw 6-7 in., jigsaw, grinder 4-5 in., hammer drill, oscillating multi-tool, work light
• 36V/40V platform = circular saw 8-9 in., mitre saw, table saw, breaker, demolition hammer, chainsaw, leaf blower, lawn mower
• 12V platform = compact drill driver, ratchet, polisher, glue gun — for detailed carpentry work

Platform Selection Flowchart

flowchart TD
  A[Identify main job] --> B{Job type?}
  B -->|Steel/wood/general construction| C[18V Pro Platform]
  B -->|Heavy demolition
concrete cutting
chainsaw| D[36V Heavy Platform]
  B -->|Furniture work
fine detail| E[12V Compact]
  C --> F{Continuous work
how many hr/day?}
  F -->|< 4 hr| G[2× 4.0Ah Battery]
  F -->|4-8 hr| H[2× 5.0Ah + 1× 8.0Ah]
  F -->|> 8 hr fleet| I[3-4× 8.0Ah
+ dual port charger]
  D --> J{Have backup
power?}
  J -->|Outlet nearby| K[2× 8.0Ah is enough]
  J -->|Moving between sites| L[3-4× 8.0Ah]
  G --> M[1 Brand 1 tradesperson — no mixing]
  H --> M
  I --> M
  K --> M
  L --> M

Battery Size Comparison Table — How Much Each Job Needs

Watt-hours (Wh) = Voltage × Ah. 18V 8.0Ah = 144 Wh = close to the kWh of a small EV scooter. Big jobs require calculating total Wh required vs battery pack

Brushless vs Brushed — Engineering Difference

Brushed Motor (old technology):

• Carbon brush + commutator sends current into the rotor
• Brush wears → must be replaced every 50-200 hours
• Efficiency 70-80%
• Loud, high vibration

Brushless Motor (new technology):

• Electronic commutation (ECU) sends current to the stator coil
• No wearing parts
• Efficiency 88-93%
• Quiet, low vibration

The real difference: a brushless 18V impact driver drives 1,500-2,000 lag bolts per charge vs 800-1,200 for brushed. The service life of brushless is often > 5 times that of brushed.

Today, 2026: brushless is standard in the Pro line of every brand. Brushed remains only on budget DIY models < 3,000 baht.

Factors That Lock the Platform — Cost of Switching

The cost of changing platforms after you've already invested:

So choose your first platform carefully:

• Look at the ecosystem (does it have the tools you'll want in the future)
• Look at service centers in Thailand (Bosch / Makita have the widest coverage)
• Look at replacement battery prices (Milwaukee M18 batteries are ~20-30% more expensive than Makita LXT)
• Look at warranty in Thailand (Bosch 3 years / Makita 1 year + 3 years with registration / Milwaukee 5 years registered)

5-Year TCO — Example: 1 Construction Tradesperson

Choose 36V only if 30%+ of the work needs 36V power — otherwise, investing in 18V + an AC outlet for occasional heavy work is better value.

6 Procurement Guidelines

1. Lock 1 platform per tradesperson — don't mix brands, no 3rd-party adapters
2. Brushless as standard for fleet work — the 5-year TCO is 30% better than brushed
3. Battery Ah by job — light work 4.0Ah × 2, heavy work 8.0Ah × 2, fleet 12.0Ah
4. Combo Kit is better value if you use every tool — check the part number before buying (don't end up with brushed)
5. Fast/dual-port charger — 18V 8.0Ah fully charges in 55 minutes (rapid charger) vs 110 minutes (standard)
6. Service center + warranty — Bosch/Makita have wide service coverage. Milwaukee's 5-year warranty is worthwhile if used frequently

Summary

18V Pro Platform covers 95% of general Thai trade work — Bosch Professional 18V, Makita LXT, Milwaukee M18 are all mature platforms. 36V/40V is for heavy work — circular saw 8 in.+, demolition hammer, chainsaw — invest only if 30%+ of the work needs it. Brushless is the new standard — TCO 30% better than brushed. Choose your first platform carefully — switch cost is ~60-70% of the original investment.

Sahawatthanakit sells genuine BOSCH / Makita / Milwaukee tools with warranty registration and a service network — consult the team for a TCO comparison of each platform based on the customer's real work.

Frequently Asked Questions

18V vs 36V, who wins? It's not about winning — 18V covers 95% of general work (drill, impact, saw, grinder). 36V is for heavy work (8" saw, demolition, chainsaw). Cost is 2-3 times higher

Is higher Ah better? 4.0Ah = 72Wh, 8.0Ah = 144Wh. Light work 2-3Ah is enough. Medium work 4-5Ah. Heavy work 8-12Ah. An 8.0Ah is 80-150% more expensive than a 4.0Ah — worth it if you use long runtime

Brushless vs brushed? Brushless efficiency +30-50%, lifespan 5-10x longer, power +25-50%. 30-60% more expensive but TCO is worth it. Today every brand's pro line is brushless

Can you mix brands? No — proprietary connector + voltage + thermal sensor. 3rd-party adapters void the warranty + carry safety risk. 1 platform/tradesperson

How many years does a battery last? Li-Ion IEC 62133-2 — 500-1,000 cycles before dropping to 80%. In reality 3-5 years. Store at 5-40°C, 40-60% charge, maintenance charge every 3 months

Is a Combo Kit better value than buying separately? 30-50% better value if you use every piece. Check the part number — some combos include brushed models