Safe Charge Sleeve E Series
Safe Charge Sleeve E Series
Safe Charge Sleeve E Series
Safe Charge Sleeve E Series
Safe Charge Sleeve E Series
Safe Charge Sleeve E Series

Safe Charge Sleeve E Series

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Engineered protection for your e-bike and other large batteries.

Save lives and protect your home or business. The CellBlock Safe Charge Sleeve E Series offers proven protection from battery fires. Safely charge and store high energy batteries for your:

  • E-bike
  • E-scooter
  • RC car
  • Drone
  • Power tools
  • Outdoor power equipment


  • Durable exterior silicone coating
  • Easy-to-use Velcro-and-buckle closure
  • Available in three sizes
  • Tested safe for batteries up to 800Wh (.8kWh)


  • Rated for temperatures over 1823 °F (1000 °C)
  • Custom engineered organic vapor filters for mitigation of pressure and explosions
  • Multi-layered FireShield® composite made by CellBlock
  • Kevlar-reinforced blast-proof seams

REAL 3rd-party testing using batteries at 100% state-of-charge demonstrating FULL containment of fire, explosions and projectiles.

Third-Party Certifications:

  • 30 Minute Powerplant Fire Penetration Test
  • 14 CFR, Part 25 D §25.853 60 Second Vertical Burn Test
  • 14 CFR, Part 25 D §25.853 5 Minute Cargo Liner Burn Test
SKU Sleeve Size† ECR*
25” x 12” x .25”
(64cm x 30cm x .6cm)
250 Wh
CBSCS-E550M 28” x 15” x .5”
(71cm x 38cm x 1.3cm)
550 Wh
CBSCS-E550L 34” x 15” x .5”
(86cm x 38cm x 1.3cm)
550 Wh
CBSCS-E800 32” x 17” x .625”
(81cm x 43cm x 1.6 cm)
800 Wh

 †Excluding hardware
*ECR (Energy Containment Rating) indicates maximum watt hours

How to Choose the Correct Sleeve Size

(Click to enlarge image.)

Choosing the correct sleeve is important to ensure effectiveness.

First, determine energy storage requirements. Battery watt hours should be printed on the battery or are available from the manufacturer. Your battery’s listed energy in watt hours must be less than or equal to the sleeve ECR (Energy Containment Rating). NEVER use a sleeve that is not rated for your battery’s watt hours, regardless of the battery’s dimensions. (See image below.)

2. FIT

Next determine fit. Determine the length (L) by measuring end to end. The best way to find the perimeter (P) is with a flexible tape measure wrapped around the widest part of the battery. Alternately, you may determine approximate perimeter using the following formula: (width + height) x 2 = perimeter

Use the chart above to find the recommended sleeve size for your battery.


NOTE: Due to high demand, we are currently experiencing longer than normal lead times on this item. Your Safe Charge Sleeve will ship within 4-6 weeks.


CellBlock FCS makes no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to these products and procedures for any purpose. In no event will CellBlock FCS be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from the usage of these products.