Ebike Battery Guide

Written by OFERO Philippines Editorial Team · Reviewed by Willy, OFERO Philippines · Published 2026-10-19 · Last updated 2026-10-19

Drafted with AI assistance; facts checked by Willy, OFERO Philippines against the sources listed below.

An ebike battery is rated in volts (V) and amp-hours (Ah); multiply them to get watt-hours (Wh), the energy it stores, so a 60V 24Ah pack holds 1,440 Wh.⁸ NMC and LFP lithium-ion cells store about 90–220 Wh/kg, against about 30–50 Wh/kg for standard and sealed lead-acid, so for the same energy the cells are about 2 to 7 times lighter.¹² Rated life, which depends on how deeply the pack is drained, is about 200–300 cycles for deep-cycle lead-acid, 1,000–2,000 for NMC and 2,000+ for LFP; drained fully every time, about 150–200, 300 and 600.³¹⁴ Higher voltage (48V, 60V, 72V) means less current for the same power and more top speed from a given motor, not more range unless Wh rises.⁷⁸

Ebike battery types: lithium-ion vs lead-acid

Ebike batteries come in two families. Lead-acid is the older chemistry, built from 2V cells.² Cells in series add their voltages,⁷ so four 12V blocks in series make 48V. Lithium-ion has several types, including NMC (nickel manganese cobalt) and LFP (lithium iron phosphate).¹

• Weight. For a 1,440 Wh pack, lead-acid cells alone would weigh about 29–48 kg, against about 6.5–9.6 kg for NMC and about 12–16 kg for LFP (our calculation; casing adds more).
• Usable capacity. Under ebike loads, a lead-acid pack often gives only 60–70% of its rated Ah.⁸
• NMC or LFP. NMC is lighter for the same Wh. LFP is rated for more cycles, and Battery University calls it one of the safest lithium-ion types.¹

Battery capacity: how to read V, Ah and Wh

• Volts (V) is the pack's nominal electrical pressure. Cells connected in series add up to the pack voltage.⁷
• Amp-hours (Ah) is the charge the pack can deliver. Cells connected in parallel add their Ah.⁷
• Watt-hours (Wh) is the stored energy, like the size of a fuel tank: Wh = V × Ah.⁸

Compare batteries in Wh, not Ah. A 48V 24Ah pack (1,152 Wh) stores less energy than a 60V 20Ah pack (1,200 Wh), even though its Ah number is bigger. Some brands skip V and Ah and list kWh instead; 1.5 kWh is 1,500 Wh.⁹

48V vs 60V vs 72V: what higher voltage means

Ebike voltage comes with the vehicle: it is set by the controller electronics and cannot be readily changed.⁸ A higher voltage changes four things:

• Less current for the same power. Power is volts × amps, so 1,200 W needs 25 A at 48V but about 17 A at 72V. Higher-voltage packs keep the wiring thinner.⁷
• Speed. Battery voltage sets the maximum speed of a given motor (see what decides top speed).⁸
• More cells in series. A pack is only as strong as its weakest cell, so cell quality matters more.⁷
• Not more range by itself. A 72V 20Ah pack holds the same 1,440 Wh as a 60V 24Ah pack.

Both list 2,304 Wh but different range: lead-acid gives less of its rated Ah under load⁸ and weighs more,²¹ and each range is the brand’s own listed figure; neither page says how it was measured.

How to read a battery label

A pack label or listing should give at least the chemistry, the nominal voltage and the Ah; multiply the last two to get Wh.⁸ The table explains the fields you are likely to see, with example values for a 48V-class lithium-ion pack. Short definitions of these and other battery words are in the ebike glossary.

Philippine marks are different. DTI tells buyers to check for an ICC sticker (imported products) or PS mark (locally made products) on goods under mandatory standards, and to verify PS marks through the ICC Verification App; ask whether one applies to the battery.²³

Lead-acid or lithium-ion? Ask in writing

When a listing gives only a trade name, get the chemistry, V, Ah, rated cycle life and charge voltage in writing before you pay (on the listing, the receipt or in a message): they decide which charger and care rules apply. These clues can point to lead-acid:

• Sealed-battery names. The most common types of sealed lead-acid are gel, also called VRLA (valve-regulated lead-acid), and AGM (absorbent glass mat); smaller sealed packs, up to about 30Ah, are often called SLA.³
• 12V blocks. Six 2V lead-acid cells make a 12V block,⁷ so a 48V set is four blocks, 60V five and 72V six (our calculation). Ask whether a listing is for one block or the full set.
• Weight. For the same Wh, lead-acid cells weigh about 2 to 7 times as much as lithium-ion cells (see the comparison table).
• “Graphene”. The word does not mean lithium-ion. A battery maker told a 2017 Electrochemical Society meeting that its lead–graphene grids had been used in over 30 million lead-acid ebike batteries.²⁴ Ask the seller to state the chemistry in writing.

Single vs dual battery

A dual-battery ebike carries two packs: more Wh and range, but more weight, a longer full charge and a higher price. Range does not always double, as the VinFast listings below show, and a full 0–100% charge goes from 4.5 to 9 hours.⁹¹⁰

Before choosing, ask: are both packs the same V and Ah? Can the ebike run on one pack? Can each pack be removed, and what does it weigh? Does the written warranty cover both?

Battery lifespan: cycles, deep drains and heat

Battery life is counted in cycles: one discharge followed by one recharge. Battery University ties each rated figure in the comparison table to depth of discharge, and the lithium ones also to temperature.³¹

Deep drains cut the count. For NMC and LFP, the 100%-drain estimates in the table count cycles until capacity falls to 70%; drained only 40% each time, the estimates rise to about 1,000 cycles for NMC and 3,000 for LFP. Real-life expectancy tends to be lower than lab estimates.⁴

Batteries also degrade over time in storage, faster in heat (Battery University counts above 30°C as elevated temperature)⁴ and at full charge: stored a year at 40% charge, a cobalt-based lithium-ion battery keeps about 96% of its capacity at 25°C and 85% at 40°C, but about 65% if stored full at 40°C.⁵ For sealed (VRLA) lead-acid, every 8°C above 25°C cuts battery life in half.³

Care basics:

• Keep the battery out of direct sun and heat where you can.
• Lithium-ion: partial charges are fine; avoid running it empty often.⁴
• Lead-acid: recharge after riding and never leave it flat, because low charge causes sulfation.³⁸

For charging habits that help a pack last, see how to charge an ebike safely.

Before you replace a battery: what to check

Before planning an ebike battery replacement, rule out a safety problem: if the battery feels extremely hot, swells, leaks or smells strange, stop using it and follow the warning-sign steps below.¹⁵

When shorter range means a test

Battery University treats a capacity measurement as the main guide to when a pack should be replaced; the replacement point varies with how the battery is used.²⁵ Have the battery tested at a shop if:

• on similar trips, a full charge no longer takes you nearly as far as when the battery was new;
• a lead-acid battery no longer takes a full charge. Battery University says one that keeps missing its topping charge (the slow stage that fills the last 30% or so) eventually cannot accept a full charge, and its performance falls because of sulfation.²⁶

Replacement checklist

• Same voltage. The controller electronics set the voltage,⁸ so the new pack needs the same nominal voltage. The U.S. Consumer Product Safety Commission (CPSC) says to use only a replacement pack tested and approved to work safely with your device.¹³
• Same chemistry, unless the maker approves a change. Going from lead-acid to lithium-ion needs a pack and charger the maker approves for that ebike; see the questions below.¹³
• A matching charger. Each chemistry charges its cells to a different voltage,²¹ so a different chemistry or cell count needs a different charger. See how to match an ebike charger.
• Connector, size and mounting. The new pack should plug in and lock into the battery bay the way the old one did, but a fit alone proves nothing: the voltage, chemistry and approval checks above still apply. A spliced-on plug or rewired pack is a modification, and CPSC warns never to use a battery pack modified or reworked by unqualified people (see the repair question below).¹³
• BMS for lithium-ion. Ask whether the pack has a built-in battery management system (see the label table).
• The full set for lead-acid. Ask whether all the 12V blocks should be replaced together.
• Written warranty. For the battery, ask whether it counts time, charge cycles or both, how cycles are counted and what capacity loss is covered; see warranty, parts and service for what the Consumer Act requires.
• The old battery. Take a used battery to a battery recycler or a hazardous waste collection center. Never throw lithium batteries into the trash or general recycling.¹³

Battery fire safety: chargers, damage and modifications

Ebike battery fires happen in the Philippines. In April 2023, a house fire in Pangasinan killed a family of five; the Bureau of Fire Protection (BFP) in Pozorrubio traced it to an overcharged ebike left plugged in overnight.¹⁶ In a January 2024 report, the BFP chief warned that overcharging can start fires, especially with low-quality products.¹⁷ In August 2024, authorities blamed an overcharged ebike battery for a fire in Biñan City, Laguna, and advised riders not to leave ebikes charging for long periods.¹⁸

Thermal runaway is when a lithium-ion cell overheats out of control; Battery University lists the thermal runaway point of LFP at a higher temperature than NMC.¹

• Use the matching charger and stay nearby. Use only the charger provided with the device or recommended by its maker, not a “universal” one; do not charge while asleep or away from home, and unplug when done (see safe charging).¹³¹⁴
• No DIY modifications. Use certified packs and approved replacements only: no packs reworked by unqualified people, no used cells, no pack of another voltage.¹³⁸
• Dispose properly. Lithium batteries do not go in the trash; lead-acid does not go to landfill.¹³⁶

Warning signs: stop using the battery

Switch off and unplug if a battery feels extremely hot, swells or leaks, makes hissing, cracking or popping sounds, smells strange, or smokes. If it smokes, get out and call for help.¹⁵ In the Philippines, dial 911.¹⁷