🔋 All You Need to Know About Batteries for PMA, PAB & PMD

Whether you're riding a personal mobility aid (PMA), power-assisted bicycle (PAB), or personal mobility device (PMD) like an e-scooter, your battery is the heart of your ride.

But with terms like 48V, 20Ah, BMS, and discharge rate floating around, it’s easy to get lost.

At baozaboy™, we believe in helping you make informed decisions — so here’s a simple guide to understanding the basics of PMA/PAB/PMD batteries.

⚡ What is a Battery?

A battery stores electrical energy and powers your motor so you can ride. Most PMA/PAB/PMD batteries are lithium-ion or lithium iron phosphate (LiFePO4), known for being lightweight, rechargeable, and efficient.

🔌 What is Battery Voltage — and Why It Matters?

Voltage (V) measures the electrical pressure or force pushing current from the battery to your motor.

Common voltages: 36V, 48V, 52V, 60V, and 72V.

Why it matters:

• Higher voltage = more power and speed

• Voltage must match your motor/controller rating (don’t mix!)

• Upgrading from 48V to 60V may give more torque — but only if your motor/controller supports it

📌 Example: A 72V system delivers faster acceleration and better hill climbing, but it's more expensive and requires a compatible controller and motor.

🔋 What is ah (Ampere-Hour) — Battery Capacity Explained

The ah (Amp-hour) rating tells you how much energy storage the battery has. In simple terms, it’s your battery’s fuel tank.

Why it matters:

• Higher ah = more capacity

• You’ll be able to travel further without needing to recharge

• Larger ah also means the battery is physically bigger and heavier

📌 Example:

• 48v 10ah = approx. 10–15km range

• 48v 20ah = approx. 20–30km range

🛢️ Think of it like a fuel tank — more ah = longer distance.

⚡ What is Battery Discharge Rate?

Discharge rate refers to how fast the battery can deliver power to your controller/motor. It’s measured in amps (A) or C-rate.

Why it matters:

• High-discharge = suitable for high-performance motors/controller

• Low-discharge batteries can overheat, cut off, or even get damaged if pushed too hard

• Your system needs to match your battery’s discharge capabilities

📌 Example:

A 48v 20ah battery with a 30A BMS can safely support up 30A discharge. (1000w controller)

⚙️ How Discharge Rate is Typically Matched

• On average, every 5ah = ~10a discharge, depending on the battery cells and brand used

• So a 48v 30ah battery typically supports a 60A discharge

• A 60v 20ah battery usually supports around 40A discharge

However, if high-discharge cells are used (like Dogecel, Molicel, or Samsung 40T), the discharge rate can go even higher.

✅ Always check the battery cell spec + BMS rating to confirm.

🧠 What is a BMS (Battery Management System)?

The BMS is like the brain of the battery — it protects and manages your battery cells.

Key functions:

• Prevents overcharging, over-discharging, and overheating

• Balances the cells to improve battery lifespan

• Cuts off power in unsafe conditions (e.g., short circuits or thermal runaway)

📌 Even if the cells can handle high discharge, the BMS will cap the output. A casing-style battery is typically limited to a 25A BMS due to size and heat constraints.

✅ Summary: What You Should Know Before Buying a Battery

Feature: Voltage (V)

What it means: Power level (e.g., 48v, 60v)

Why it matters: Affects speed & compatibility

Feature: Capacity (ah)

What it means: Energy storage (e.g., 10ah, 20ah)

Why it matters: Affects how far you can travel

Feature: Discharge Rate

What it means: How much current it can supply

Why it matters: Must match motor/controller demand

Feature: BMS

What it means: Smart protection system

Why it matters: Keeps battery safe & long-lasting

💬 Not Sure What Battery Suits Your Setup?

Whether you’re replacing a dead battery or upgrading for more range and power, baozaboy™ offers:

✅ Custom battery builds

✅ Battery repair & BMS upgrades

✅ Factory-built or locally assembled options

✅ Safe disposal for old batteries

✅ Consultation for matching motor/controller systems

📦 Shop now at shop.baozaboy.xyz

📲 WhatsApp us at 8048 8550 for advice or a free quote

Your ride starts with the right battery. Ride smart. Ride safe. Ride baozaboy™.