| For loose cells and custom
battery packs click here:  For a chart of the sizes and
weights of cylindrical batteries click here:
For more battery engineering
resources click here:
Custom design and manufacture of
state-of-the-art battery chargers, UPS, and power supplies for OEMs in
a hurry!
Advantages:
 NiMH batteries are smaller
and lighter than lead acid batteries, making them a good choice for
high performance bicycles and scooters.
Over 80% greater run time versus
lead acid of the same size.
Sustained operating voltage makes
the scooter seem to have a fresh charge over most of the operating
time. Lead acid voltage sags continuously over the discharge curve
making the scooter slower through most of the run time.
Also available in custom voltages,
sizes, capacities, and configurations. This is PowerStream!
Low cost compared with other NiMH
manufacturers. We set out to design a drop-in
replacement for lead acid in personal electric vehicles. This is a
smaller, lighter, better performing replacement, but with a premium
cost. Data:
The
following comparison tests were done with a 24 volt "Amplifier"
electric scooter:
| | Lead Acid | NiMH | Improvement |
| Battery
Format | 2 x 12V SLA Batteries | 20
x 1.2 V D cells | |
| Rated Capacity | 8
AH | 8.5 AH | |
| Battery Mass | 5.5
kg (12 lb) | 3.4 kg (7.5 lb) | 40
% lighter | | Battery
Size | 12 x 2.6 x 3.7 in. | 10.2
x 2.4 x 3.6 in. | 24% less volume |
| Maximum operating
current (note 1) |
29.8 Amps | 30.1 Amps | |
| Average
Operating Current (note 1) |
11.1 Amps | 10.6 Amps | |
Total run
time
(note 4) |
27 minutes | 46 minutes | 70%
longer | Reduced
Performance
(note 2) |
21 minutes | 35 minutes | 66%
longer | | Loss
Performance (note 3) |
24 minutes | 45 minutes | 88%
longer | | Test
differences | Multiple rest cycles | One
rest cycle | | | Test differences | Total
run time includes three loss of power events with rests in between |
Test terminated upon the first loss of power | |
Notes:
1)156 lb test engineer on residential/business
area test course, almost constant slopes up and down.
2) Indicated time is the first instance of a
noticeable loss in performance.
3)
Indicated time is the first instance of a complete loss of performance
4) Total run time is greater than the loss of
performance time because the scooter was run again after a rest without
recharging.
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