Updated 17 Aug 2016

Powerex

Maha IMEDION 2400 MH4AAIBH

Bottom line: The Powerex Maha IMEDION 2400 MH4AAIBH has very good battery life per use and OK long-term endurance. But its construction is flimsy.

Maha IMEDION  2400 MH4AAIBH
Consumer score
70
Avg price

$7.24

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Test results

Overall score
Good
70
Battery life
Very good
89%
Long term endurance
OK
56%
Charge retention
OK
62%
Ruggedness
Just OK
50%

Good points

  • Very good battery life per use.
  • OK long-term endurance.
  • OK charge retention.

But

  • Flimsy construction.

How we test

We place the batteries in a computer-controlled test rig that charges them, then discharges them at a rate equivalent to the demand of a high-drain device — like a remote-controlled car. Once the cell voltage reaches 1.0V, equivalent to empty for most power-hungry devices, the rig charges them again.

  • We judge each battery’s long term endurance by measuring how many cycles until its capacity falls to half its initial value.
  • The battery’s average capacity over the amount of charge/discharge cycles before failure gives our battery life per use score.
  • Rechargeable batteries gradually lose charge while sitting idle. We measured this rate of “self-discharge” for each battery to get our charge retention in storage score.
  • We also look at the ruggedness of each battery’s construction by placing them in a rotating cylinder (a bit like a gentle tumble-dryer) for 24 hours, before taking them out and sorting them from least to most damaged.

Key data

Product

Avg price
$7.24

Specifications

Type
NiMH
Cycles to failure
92
Total lifetime capacity (mAh)
208000
Measured initial capacity (mAh)
2434
Average capacity (mAh)
2066
Average discharge time (min)
111
Annual charge loss in storage (%)
53