Updated 17 Aug 2016

Powerex

2700 Rechargeable MH4AA270BH

2700 Rechargeable MH4AA270BH
Consumer score
SCORE
Avg price

$7.49

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Test results

Overall score
74
Battery life
?/10
Long term endurance
?/10
Charge retention
?/10
Ruggedness
?/10

Good points

  • Excellent battery life per use.
  • OK charge retention.
  • Fairly rugged construction.

But

  • Just OK long-term endurance.

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
$7.49

Specifications

Type
NiMH
Cycles to failure
73
Total lifetime capacity (mAh)
187000
Measured initial capacity (mAh)
2691
Average capacity (mAh)
2515
Average discharge time (min)
119
Annual charge loss in storage (%)
46